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24-02-2016
Mathematics

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If y=-12, when x=9, find y when x=-4

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apologiabiology apologiabiology

24-02-2016

2 different things
if it is
xy=k or if it is x/y=k
direct or inverse variation

I will do the x/y=k one
9/-12=-3/4
x=-4
-3/4=-4/y
mutiply both sides by y
-3/4y=-4
mutiply both sides by -4/3 to clear fraction
y=16/3

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