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OpenStudy (anonymous):
The variables x and y vary directly. Write an equation that relates x and y, when x = 4 and y = 2. A. y = -2x B. y = -1/2x C. y = 1/2x D. y = 2x
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OpenStudy (saifoo.khan):
\[y = \frac 12x\]
OpenStudy (anonymous):
Direct variation is y = kx where k is some number. 2 = k(4) divide by 4 to find k 1/2 = k put it back into the original y = kx equation y = 1/2x
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