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Question 154170: for writing and interpreting direct variation
problem: if y= -4 when x=(1/2), find y when x=(2/3)
y= kx k= y/x k= -4/(1/2) y= -8x y= -8(2/3) y= -(16/3)
how do you find y after you plugged x into the equation??
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! problem: if y= -4 when x=(1/2), find y when x=(2/3)
y= kx k= y/x k= -4/(1/2) y= -8x y= -8(2/3) y= -(16/3)
how do you find y after you plugged x into the equation??
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Direct variation implies y = kx
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You are told y=-4 when x = 1/2
Solve for "k".
-4 = k/(1/2)
k = -2
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so, the equation for your problem is y = -2x
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Now, find y when x = 2/3
y = -2(2/3)
y = -4/3
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Cheers,
Stan H.
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