1MA0 Higher June 2017 Paper 2 Q24
24 The straight line L has equation \(4x + y = 7\)
Find an equation of the straight line perpendicular to L that passes through \((-8, 3)\). (4)
| Answer | Mark | Notes |
|---|---|---|
| \(y = \dfrac{1}{4}x + 5\) | 4 | B1 for \(m = -4\) M1 (indep) for gradient of perpendicular \(= -\dfrac{1}{\text{``}{-}4\text{''}}\) or \(\dfrac{1}{4}\) M1 (dep on previous M1) for substituting \(x = -8\), \(y = 3\) into \(y = \text{``}\dfrac{1}{4}\text{''}x + c\) A1 for \(y = \dfrac{1}{4}x + 5\) oe SC If M0 is scored then B2 for \(y = -\dfrac{1}{4}x + 1\) |