If y varies directly as x, find the direct variation equation for the situation.
-$$y = 7.2 \text { when } x = 0.9$$
A) $y = 0.125 x$
B) $y = 8 x$
C) $y = 0.9 x$
D) $y = x + 6.3$

Question

Quizplus · Accepted Answer

In direct variation, $y = kx$. Given $y = 7.2$ when $x = 0.9$, solve for $k$: $7.2 = k \times 0.9$, so $k = 8$. Thus, the equation is $y = 8x$.

If Y Varies Directly as X, Find the Direct Variation y=7.2 when x=0.9y = 7.2 \text { when } x = 0.9y=7.2 when x=0.9

If Y Varies Directly as X, Find the Direct Variation $y = 7.2 \text { when } x = 0.9$