There was an error loading the page.
History and Feedback
Christian Lawson-Perfect 2 years, 3 months ago
Saved a checkpoint:
Set up the randomisation again so that all numbers are integers.
In part a, the $x$ coefficient of the second equation is a multiple of the coefficient in the first equation.
In part b, the LCMs of the $x$ and $y$ coefficients are strictly larger than any of the coefficients.
Lauren Richards 2 years, 4 months ago
- I've made sure that the solutions are integers but that has meant that the question is not randomised.
- I'm also having a little trouble in centering a section of part a) which includes an overline and a subtraction.
- Otherwise, I've made all the changes you requested.
Christian Lawson-Perfect 2 years, 4 months ago
Saved a checkpoint:
I'd prefer it if you made sure that the solutions are always integers. Rounding errors are a distraction here. Generate the solutions first, then come up with a pair of independent equations.
I'm not sure about the way you've set out subtracting one equation from another - it's not obvious that the minus signs cancel out when there's a negative coefficient. This is one of the big problems that trips people up when doing this.
Be careful with, for example, "We have to multiply the entire first equation by 3, not just the x term to ensure we do not change the value of the equation." - an equation doesn't have a 'value'. You could instead say that you want to keep the same solution.
Right at the end of the advice, I don't like $8(5)$ for multiplication - $8 \times 5$ is much more conventional.
No variables have been defined in this question.
This variable doesn't seem to be used anywhere.
Error in variable testing condition
There's an error in the condition you specified in the Variable testing tab. Variable values can't be generated until it's fixed.
No parts have been defined in this question.
Select a part to edit.
Test that the marking algorithm works
Check that the marking algorithm works with different sets of variables and student answers using the interface below.
Create unit tests to save expected results and to document how the algorithm should work.
There's an error which means the marking algorithm can't run:
Click on a note's name to show or hide it. Only shown notes will be included when you create a unit test.
No unit tests have been defined. Enter an answer above, select one or more notes, and click the "Create a unit test" button.
The following tests check that the question is behaving as desired.
This test has not been run yet This test produces the expected output This test does not produce the expected output
This test is not currently producing the expected result. Fix the marking algorithm to produce the expected results detailed below or, if this test is out of date, update the test to accept the current values.
One or more notes in this test are no longer defined. If these notes are no longer needed, you should delete this test.
|This note produces the expected output||Current:||
This test has not yet been run.
In order to create a variable replacement, you must define at least one variable and one other part.
|Variable||Answer to use||Must be answered?|
The variable replacements you've chosen will cause the following variables to be regenerated each time the student submits an answer to this part:
These variables have some random elements, which means they're not guaranteed to have the same value each time the student submits an answer. You should define new variables to store the random elements, so that they remain the same each time this part is marked.
This question is used in the following exams:
- maths practice-revision by David Martin in David's workspace.
- Week 2 - Practice Exercises by Bobby Kahlon in Bobby's workspace.
- HI by Pádhraic O' Hanrahan in Numbas Workshop.
- Example exam by Emma Howard in Emma's workspace.
- My first test by Marie Nicholson in Marie's workspace.
- Linear equations test by John Sheekey in John's workspace.
- Test on some stuff by Christian Lawson-Perfect in Christian's workspace.
- P1 - Algebra & Functions by Rob Beckett in Rob's workspace.
- Simultaneous Eqns Test by Ann Smith in Ann's workspace.
- Week 4 - Simultaneous Equations by Paul Finley in Paul's workspace.
- Algebra by Katie Bullen in Katie's workspace.
- Essential Maths exam by Maria Aneiros in Maria's workspace.