If y ∝ x² and y = 18 when x = 3 find y when x = 5?
- 40
- 50
- 60
- None of these
Explanation
Given y = 18 when x = 3:
18 = k(3²)
18 = 9k
k = 2
Now for x = 5:
y = 2(5²)
y = 2 × 25
y = 50
Last verified on 15-05-2026
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