Use the gradient formula m = (y2 − y1)/(x2 - x1) with points A(-3, 2) and C(9, 10).

Here are the solutions to Question 2:

2.1 Calculate the gradient of the line AC.

Step 1: Use the gradient formula $m = \frac{y_2 - y_1}{x_2 - x_1}$ with points $A(-3, 2)$ and $C(9, 10)$.

$$m_{AC} = \frac{10 - 2}{9 - (-3)}$$ $$m_{AC} = \frac{8}{9 + 3}$$ $$m_{AC} = \frac{8}{12}$$ $$m_{AC} = \frac{2}{3}$$

The gradient of AC is $\boxed{\frac{2}{3}}$.

**2.2 Determine the equation