Higher January 2021 Paper 1 Q13

EdexcelHigherCurrent spec3 marksLinear Graphs & Gradients

13 Point \(A\) has coordinates \((5, 8)\)
Point \(B\) has coordinates \((9, -4)\)

(a) Work out the gradient of \(AB\). (2)

The straight line L has equation \(y = -4x + 5\)

(b) Write down the gradient of a straight line that is perpendicular to L. (1)

Mark scheme (a)

Scheme	Marks
\(\dfrac{8 - -4}{5 - 9}\left(= \dfrac{12}{-4}\right)\) oe or \(\dfrac{-4 - 8}{9 - 5}\left(= \dfrac{-12}{4}\right)\) oe	M1
Correct answer scores full marks (unless from obvious incorrect working) Answer: \(-3\)	A1
	(2)

M1: condone correct gradient embedded in an equation e.g. \(y = -3x + c\)
or expression e.g. \(-3x\)
or for an answer of 3