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23-06-2015
Mathematics

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If y varies directly as x and y = 144 when x = 12, what is the value of y when x = 17?

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23-06-2015

Direct variation:
[tex]y=kx[/tex]

y=144 when x=12.
[tex]144=12k \\ k=\frac{144}{12} \\ k=12[/tex]

y=? when x=17.
[tex]y=12 \times 17 \\ y=204[/tex]

y=204 when x=17.

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