If y ∝ x² and y = 50 when x = 5 find y when x = 2?
- 7
- 8
- 9
- None of these
Explanation
y ∝ x^2 means y = k x^2, where k is a constant.
Given: y = 50 when x = 5
Put values:
50 = k _ 5^2
50 = k _ 25
k = 50 / 25
k = 2
Now find y when x = 2:
y = k x^2
y = 2 _ 2^2
y = 2 _ 4
y = 8
Last verified on 23-05-2026
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