WAEC 2025 · Paper 1 · Q19✱✱

Inequalities
Coordinate geometry

Which inequality is illustrated by the sketch graph? The boundary line passes through $(0, 3)$ and $(1, 0)$ , and the region below the line is shaded.

Worked solution (try it first)

The gradient of the line through $(0, 3)$ and $(1, 0)$ is $\frac{0 - 3}{1 - 0} = -3$ , and the $y$ -intercept is 3.
So the line is $y = -3x + 3$ .
The region below a line is $y \le$ the line's expression.
So it is $y \le -3x + 3$ , option A.

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