First, let's find the gradient for each pair of points:
a) The gradient between A(1,2) and B(3,8) is:
\( m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{8 - 2}{3 - 1} = \frac{6}{2} \)
b) The gradient between A(0,6) and B(3,9) is:
\( m = \frac{y_2 - y_1}{x_2 - x_1} =
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