Edexcel – foundation
\[ \begin{array}{l} \text{The line $M$ is shown on the grid.} \\ \text{Find an equation for $M$.} \end{array} \]
\begin{aligned} &\text{Two points from the graph: } (0,4) \text{ and } (2,0). \\ &\text{Gradient: } m = \frac{0-4}{2-0} = -2. \\ &\text{Equation: } y = -2x + c. \\ &\text{Substitute } (0,4): 4 = -2(0) + c \Rightarrow c = 4. \\ &\text{Final: } y = -2x + 4. \end{aligned}
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