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From users who are members of Transition to university :
|Chris Graham||said||Ready to use||5 years ago|
|Christian Lawson-Perfect||said||Ready to use||5 years ago|
|Bradley Bush||said||Needs to be tested||5 years, 1 month ago|
From users who are not members of Transition to university :
|Christopher boyd||said||Ready to use||4 years, 6 months ago|
Chris Graham commented 5 years 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.
Aiden McCall 5 years 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.
Chris Graham commented 5 years, 1 month 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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