JAMB 2014 · UTME · Q15

Variation

$y$ varies directly as $w^2$ . When $y = 8$ , $w = 2$ . Find $y$ when $w = 3$ .

Worked solution (try it first)

$y = kw^2$ .
Put in $y = 8$ , $w = 2$ : $8 = 4k$ , so $k = 2$ .
When $w = 3$ : $y = 2 \times 9 = 18$ , option B.

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