O-LevelMathematicsAlgebra and graphs4024/21 · Oct/Nov 2014 · Q66 Marks
f(x) = 2x - 7
- (a)Calculate f(3).[1]
- (b)Find f⁻¹(x).[2]
- (c)Find the value of g given that f(3g) = g+4.[3]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2014). The mark or mark type is shown in brackets.
- [1] -1
- [2] x+7 / 2
- [2] M1 for x = 2y-7 soi or SC1 for the answer y+7 / 2
- [3] g = 2.2 or 2 1/5 or 11/5
- [3] B1 for 2(3g) -7=g+4 soi
- [3] and B1 for mg = 11 or 5g = n
- [3] or SC1 after BO for solving their linear f(3g) = g + 4
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