Answer
y=-20x
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Work Step by Step
Since the general form of a direct variation is y=kx,. lets substitute the value of x and y into this equation:
-5=1/4k (Divide both sides by 1/4)
-20=k
Now plug in this value of k into the standard form of a direct variation:
y=-20x
This is our equation the relates both x and y for this situation.