The points A and B have coordinates (-2, -7) and (3, 8) respectively.
a) Find the coordinates of the point at which the line through AB crosses the x axis
So I found the gradient of the line, 1/3, so the equation is y -8 = 1/3 x -1. Then I subbed 0 into y, and I got -8 = 1/3x -1. But the answer is 3x - y -1 = 0, and the coordinate is (1/3, 0), which I'm a bit confused about?