6.4 Axes Intercepts and Gradient
(A) Formula for gradient:
2. Gradient of the line with knowing x–intercept and y–intercept
3. The gradient of the straight line joining P and Q is equal to the
tangent of angle θ, where θ is the angle made by the straight line
PQ and the positive direction of the x-axis.
(B) Collinear pointsThe gradient of a straight line is always constant i.e. the gradient of AB is equal to the gradient of BC.