Gradient for a straight line is change in y/ change in x. So we get the difference in x values which is 2 - 4 =-2. We get change in y from -5 - (-9) = 4. So gradient is 4/-2 = -2

For 1b, using formula y=mx + c we work out equation of the line through A and B. M is the gradient. We sub in values of one of the known points. ( I’m gonna use A). So -5 = (-2)2 + c. If we rearrange we get c as -1. So e... more

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