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$y$ varies directly as the square of $x$. For $x = 10$, $y = 20$. Determine the value of $y$ when $x = 6$.
Mathematics 4024 · O Level · Ratio and proportion
Ratio and proportion — practice question
Worked solution & mark scheme
This 2-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Equivalently, $20 = 10^2 k$ or $\frac{20}{10^2} = \frac{y}{6^2}$” …
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