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So we have 2 points; (0,2) and (1,y). We know the gradient is 4, how do we find y?

3 Answers

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Yep you're right, y=6

(y-2)/(1-0) = 4

y-2 = 4

y = 6
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I know the formula is m = y2-y1/x2-x1, but when I substituded I couldnt remember the algebra, so I put it on the graph.
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Yes, but you could check that yourself by plugging into the slope formula. Is (y - 2) / (1 - 0) equal to 4 if y is 6?

Yes.

So it checks.

It's a good idea to do this kind of checking yourself while you're still in the test, if you have time.

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