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Assume y varies directly as x. If y = 30 when x = -3, find y when x = -9.

User Ianjs
by
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1 Answer

4 votes

Answer:

y is 90

Explanation:

The y/x is proportional per point (x,y) since this is a direct variation.

That is ,


(30)/(-3)=(y)/(-9).

Cross multiply:


30(-9)=y(-3)

Simplify:


-270=-3y

Divide both sides by -3


(-270)/(-3)=y


90=y

User Nayrb
by
7.6k points

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