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OpenStudy (anonymous):
Write the direct linear variation equation for the relationship: y varies directly with x and y = 4 when x = 12. A. y = x – 8 B. y = 3x C. y = x + 8 D. y = 1/3x
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OpenStudy (anonymous):
it's either A. or D.
OpenStudy (luigi0210):
The equation being y=kx. Plug in the values you have and solve for k.
OpenStudy (luigi0210):
Solve: \(4=12k\) for k, what do you get?
OpenStudy (anonymous):
k = 1/3?
OpenStudy (luigi0210):
Right! Now plug k into \(y=kx\) and you get..?
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OpenStudy (anonymous):
D!
OpenStudy (luigi0210):
Yup, nice job :)
OpenStudy (anonymous):
thx
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