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Checkpoint description

Describe what's changed since the last checkpoint.

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Chris Graham 2 years, 5 months ago

Fixed bug in correct line plot, caused by reading wrong student answer box (must have had a part added)

Christopher boyd 2 years, 10 months ago

Gave some feedback: Ready to use

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Chris Graham 3 years, 4 months ago

Gave some feedback: Ready to use

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Christian Lawson-Perfect 3 years, 4 months ago

Gave some feedback: Ready to use

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Christian Lawson-Perfect 3 years, 4 months ago

Saved a checkpoint:

Made sure neither of the points lies on the $y$-axis.

Split $a$ into two parts, since you need to work out the gradient before you find the $y$ intercept.

Reworded some of the advice a bit.

Restore this checkpoint

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Chris Graham 3 years, 4 months ago

Gave some feedback: Needs to be tested

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Chris Graham 3 years, 4 months ago

This was a bit of a mess, as the points A and B had originally been illogically ordered, and this had only been half fixed. 

Part a) had mathematical expression gaps which should have been number entry, and I have added fractionNumbers simplification in the advice and displayed answer.

I've adjusted the axis ranges so that the intercept is always on the grid.

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Chris Graham 3 years, 4 months ago

The points A and B should be switched; it doesn't make sense to describe the leftmost point as B, and in fact the gradient is calculated from A to B in the advice. There are places in the advice where $y_1-y_2$ needs to be inverted.

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Chris Graham 3 years, 4 months ago

Gave some feedback: Has some problems

Elliott Fletcher 3 years, 4 months ago

Published this.
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Chris Graham 3 years, 4 months ago

RE the point below from Aiden, this is OK, it is giving the student the opportunity to explore the terms in the equation and how they relate to the graph. This sort of question is really for formative use.

Aiden McCall 3 years, 4 months ago

This is also true for all other questions of this nature. 

Aiden McCall 3 years, 4 months ago

Saved a checkpoint:

I have edited the main and advice to make sense and tweaked parts. There is a problem with the question that where you put y = mx +c you can write m in the gap fill and even when restricting the string it shows what m is on the graph so you can effectively 'cheat' this also works in the same way if you type in c. I cannot think of a way to fix this without the JSXgraph code and I don't know where abouts that is.

Restore this checkpoint

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Bradley Bush 3 years, 5 months ago

Gave some feedback: Needs to be tested

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Bradley Bush 3 years, 5 months ago

Thank you for the feedback Chris, I have done everything you've suggest4ed here as well as making the same changes to differenet versions of this question.

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Chris Graham 3 years, 5 months ago

One more. If I do not attempt the question, but reveal the answers, then the advice refers to an absent green line. This is another good reason to put the correct plot in the advice.

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Chris Graham 3 years, 5 months ago

Similar points to our earlier discussion: 

This is a candidate for using the Numbas variables to set the jsxgraph axis limits. Move the block of code where you grab the Numbas variables in front of making the board, so that you have access to them. And then you can use them in the bounding box definition boundingBox:[yb-2,...] or whatever is sensible. Don't forget you'll want the intercept to be on the board.

Since you are only asking for the equation of the straight line through the points, you might consider creating a step with gapfills for the gradient and intercept, to allow the student to break the question down.

And you could add a second plot with the solution to the advice. 

One final thing: on one run I had B at the origin. You may wish to avoid this as it makes parts of the advice obsolete.

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Chris Graham 3 years, 5 months ago

Gave some feedback: Has some problems

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Bradley Bush 3 years, 5 months ago

Gave some feedback: Needs to be tested

Bradley Bush 3 years, 5 months ago

Created this.
Name Status Author Last Modified
Find the equation of a line through two points - positive gradient Ready to use Bradley Bush 16/11/2020 10:02
Find the equation of a line through two points - negative gradient Ready to use Bradley Bush 16/11/2020 10:02
Find the equation of a line through two points - zero gradient Ready to use Bradley Bush 16/11/2020 10:02
Straight line equation application: measuring sunflower height Ready to use Bradley Bush 16/11/2020 10:03
Christopher's copy of Finding a line equation through two points +ve gradient JSX draft Chris Graham 16/11/2020 10:02
Louise's copy of Find the equation of a line through two points - positive gradient draft Louise Lynch 16/11/2020 10:03
Find the equation of a line through two points - positive gradient draft Mark Hodds 16/11/2020 10:02
Ida's copy of Find the equation of a line through two points - positive gradient draft Ida Landgärds 16/11/2020 10:02
Spørsmål 1 draft Ida Landgärds 16/11/2020 10:03
Marte's copy of Find the equation of a line through two points - positive gradient draft Marte Bråtalien 16/11/2020 10:03
Thomas's copy of Find the equation of a line through two points - negative gradient draft Thomas Strasser 16/11/2020 10:03
Equation de droite Needs to be tested Alain Virouleau 30/05/2019 18:52
Linear Equations - Find the equation of a line through two points draft Paul Hancock 16/11/2020 10:03
Find the equation of a line through two points - positive gradient [L3] Needs to be tested Matthew James Sykes 16/11/2020 10:02
Beer Lambert Law Doesn't work Matthew James Sykes 16/11/2020 10:02
Beer Lambert Law Working Back up Should not be used Matthew James Sykes 16/11/2020 10:02
Joël's copy of Find the equation of a line through two points - positive gradient draft Jo Cohen 16/11/2020 10:02
Beer Lambert Law Working Back up Should not be used Matthew James Sykes 16/11/2020 10:02
Ida's copy of Spørsmål 1 draft Ida Landgärds 16/11/2020 10:02
David's copy of Straight line equation application: measuring sunflower height draft David Rickard 16/11/2020 10:02
equation of a line through two points draft heike hoffmann 16/11/2020 10:02
Equation of a line through two points - positive gradient Ready to use Angharad Thomas 16/11/2020 10:02
Luis's copy of Find the equation of a line through two points - zero gradient draft Luis Hernandez 16/11/2020 10:03
Simon's copy of Equation of a line through two points - positive gradient draft Simon Thomas 16/11/2020 10:03
Maria's copy of Simon's copy of Equation of a line through two points - positive gradient draft Maria Aneiros 16/11/2020 10:03
Maria's copy of Find the equation of a line through two points - negative gradient draft Maria Aneiros 16/11/2020 10:03
Heather's copy of Find the equation of a line through two points - positive gradient draft Heather Driscoll 16/11/2020 10:02
Equation of a line through two points - positive gradient draft Heather Driscoll 16/11/2020 10:02
Equation of a line through two points draft Philip Charlton 16/11/2020 10:02
Find the equation of a line through two points - zero gradient draft Xiaodan Leng 16/11/2020 10:02
Equation of a line through two points - positive gradient draft Xiaodan Leng 16/11/2020 10:02
Straight line equation application: measuring sunflower height draft Adelle Colbourn 16/11/2020 10:03
Paul's copy of Straight line equation application: measuring sunflower height draft Paul Verheyen 16/11/2020 10:03
WordProblem02 draft Paul Verheyen 16/11/2020 10:03
Hoogtemeting van zonnebloemen draft Paul Verheyen 16/11/2020 10:02
Hoogte van zonnebloemen Ready to use Paul Verheyen 16/11/2020 10:02
Straight line equation application: measuring sunflower height draft steve kilgallon 16/11/2020 10:03
Voor Dirk draft Faye Caluw 23/11/2020 13:50
Blathnaid's copy of Linear Equations - Find the equation of a line through two points draft Blathnaid Sheridan 16/11/2020 10:02
Dirk's copy of Equation of a line through two points - positive gradient draft Dirk Janssens 23/11/2020 13:26
Find the equation of a line through two points - zero gradient Ready to use AJAY OTTA 16/11/2020 10:02
ibrahim's copy of Find the equation of a line through two points - zero gradient draft ibrahim khatib 16/11/2020 10:02
ibrahim's copy of Find the equation of a line through two points - negative gradient draft ibrahim khatib 16/11/2020 10:02
ibrahim's copy of Find the equation of a line through two points - negative gradient draft ibrahim khatib 16/11/2020 10:02
ibrahim's copy of Find the equation of a line through two points - positive gradient draft ibrahim khatib 16/11/2020 10:02
NCM4 U1L1 Terry's copy of Straight line equation application: measuring sunflower height Ready to use Terry Young 16/11/2020 10:03
NCM4 U1L1 Terry's copy of Equation of a line through two points - positive gradient Ready to use Terry Young 16/11/2020 10:03
NCM4 U1L1 Terry's copy of Find the equation of a line through two points - negative gradient Ready to use Terry Young 16/11/2020 10:03
Equation of a line through two points - positive gradient draft Jeung-Hwan Doh 16/11/2020 10:02
Karen's copy of Find the equation of a line through two points - positive gradient draft Karen Henderson 16/11/2020 10:03
Musa's copy of Find the equation of a line through two points draft Musa Mammadov 16/11/2020 10:03
Morgiane's copy of Find the equation of a line through two points - positive gradient draft Morgiane Richard 16/11/2020 10:03
Find the equation of a line through two points - positive gradient draft Morgiane Richard 16/11/2020 10:02
David's copy of Find the equation of a line through two points - positive gradient Needs to be tested David Hodge 16/11/2020 10:02
Ahmed's copy of Find the equation of a line through two points - positive gradient draft Ahmed Al-Razaz 24/11/2020 17:10
Ahmed's copy of Find the equation of a line through two points - negative gradient draft Ahmed Al-Razaz 24/11/2020 17:10
Ahmed's copy of Find the equation of a line through two points - zero gradient draft Ahmed Al-Razaz 24/11/2020 17:11
GEOM Ecuación de la recta entre dos punto, pendiente positiva draft David Vanegas 16/11/2020 10:02
Find the equation of a line through two points - positive gradient Ready to use Simon Vaughan 16/11/2020 10:02
Julie's copy of Find the equation of a line through two points - positive gradient draft Julie Crowley 24/11/2020 16:33
Julie's Find the equation of a line through two points - positive gradient draft Judy Rea 16/11/2020 10:03
Julie's SineWave draft Judy Rea 17/09/2020 09:52
Simple SineWave plots draft Judy Rea 17/09/2020 09:52
BasicSineWave_readFrequencyFromGraph draft Judy Rea 17/09/2020 09:52
Abrari's copy of Find the equation of a line through two points - positive gradient Ready to use Abrari Hasmi 16/11/2020 10:02
Find the equation of a line through two points - positive gradient Ready to use Palat Meethale Ushasree 16/11/2020 10:02
Straight line equation application: Total cost draft Palat Meethale Ushasree 16/11/2020 10:03
Straight line equation application: measuring sunflower height Ready to use Palat Meethale Ushasree 23/11/2020 12:17
steve's copy of Straight line equation application: measuring sunflower height draft steve kilgallon 16/11/2020 10:03
Catherine's copy of Find the equation of a line through two points - negative gradient draft Catherine Palmer 24/11/2020 16:32
Spørsmål 1 draft Ida Landgärds 02/12/2020 11:02

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