MathematicsVariationWAEC
y varies directly as x², and y = 18 when x = 3. Find y when x = 4.
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Answer: B. 32
y = kx² with k = 18/9 = 2, so y = 2 × 16 = 32.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.