The points are $A(-2,3)$, $B(4,3)$ and $C(4,-1)$. State the gradient of $AB$.[1] A pupil say

Question

The points are $A(-2,3)$, $B(4,3)$ and $C(4,-1)$. State the gradient of $AB$.[1] A pupil says that $BC$ also has gradient zero. Explain why this is incorrect.[1] State the equations of $AB$ and $BC$.[2]

Accepted Answer

(a) $0$ (b) Undefined: horizontal change is zero (c) $y=3$, $x=4$

Horizontal and vertical lines

Horizontal and vertical lines

Solution:

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