Mathematics, 13.07.2019 05:00 greeneashlynt
If y varies directly as x, and y = 25 when x = 5, find y when x = 25. a. 125 b. 50 c. 15 d. 62
Answers: 2
![\bf \qquad \qquad \textit{direct proportional variation} \\\\ \textit{\underline{y} varies directly with \underline{x}}\qquad \qquad y=kx\impliedby \begin{array}{llll} k=constant\ of\\ \qquad variation \end{array}\\\\ \rule{31em}{0.25pt}\\\\ \textit{we also know that } \begin{cases} y=25\\ x=5 \end{cases}\implies 25=k5\implies \cfrac{25}{5}=k \\[2em] 5=k\hspace{20em}\boxed{y=5x} \\[2em] \textit{when x = 25, what is \underline{y}?}\qquad y=5(25)\implies y=125](/tpl/images/0083/5994/d01b8.png)
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If y varies directly as x, and y = 25 when x = 5, find y when x = 25. a. 125 b. 50 c. 15 d. 62...
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