Question 5

Level pending

If y varies directly as x, and y=9 when x=8, find y when x=16


The answer is 18.

Luye Xue by Luye Xue , 19, China

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1 solution

Luye Xue
Feb 24, 2015

y= k × x k \times x (k=the constant of variation)

9= k × 8 k \times 8

k= 9 8 \frac{9}{8}

y= 9 8 × 16 \frac{9}{8} \times 16

y=18

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