O-LevelMathematicsAlgebra and graphs4024/21 · May/June 2019 · Q79 Marks
f(x) = 5x-7 g(x) = x+4 / 3
- (a)Find f(6).[1]
- (b)Find g⁻¹(x).[2]
- (c)Given that f(p) = g(p) -2, find p.[3]
- (d)g(5x-7) = ax+b. Find a and b.[3]
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [1] 23
- [2] 3x-4 final answer B1 for 3y = x + 4 or y – 4/3 = x or 3y - 4 or x = y+4/3
- [3] 19/14 or 1 5/14 or 1.36 or 1.357 to 1.358 B2 for answer 14p = k or kp = 19 or M1 for 5p - 7 = p+4/3 - 2
- [3] a = 5/3 oe b = -1 B2 for either correct or M1 for (5x-7+4)/3
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