If y ∝ x³ and y = 54 when x = 3 find y when x = 2?
- 15
- 16
- 17
- None of these
Explanation
Since y ∝ x³, we have y = kx³ for some constant k.
1. Find k using y = 54 when x = 3:
54 = k(3³) = k(27)
k = 54 / 27 = 2
2. Now find y when x = 2:
y = 2(2³) = 2(8) = 16
Last verified on 25-05-2026
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