O-LevelMathematicsAlgebra and graphs4024/12 · May/June 2021 · Q183 Marks
y is inversely proportional to the cube of x. When x = 1/2, y = 24.
- (a)Find the formula for y in terms of x.[2]
- (b)Find the value of y when x = 1/3.[1]
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [M1] (a) y = k/x³ soi
- [A1] (a) y = 3/x³ final answer
- [1] (b) 81
- [1] (b) FT (their 3) × 27 evaluated
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