O-LevelMathematicsAlgebra and graphs4024/21 · Oct/Nov 2020 · Q107 Marks
f(x) = (3-2x)/5 g(x) = (x-7)/4
- (a)Find f(-4).[1]
- (b)Find f⁻¹(x).[3]
- (c)g(p) = f(p+1) Find the value of p.[3]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [1] 2.2 oe
- [3] (3-5x)/2 oe final answer B2 for 2y =3-5x or [x=] 3-5y / 2 or [x=] 5y-3 / -2 or y + 5x/2 = 3/2 or B1 for correct first step e.g. x = 3-2y / 5 or 5y =3-2x
- [3] 3 M2 for 5p – 35 = 12 – 8p – 8 or better or M1 for p-7 / 4 = 3-2(p+1) / 5
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