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Aleksandr [31]
3 years ago
12

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

Mathematics
1 answer:
navik [9.2K]3 years ago
7 0

Answer:

y is 90

Step-by-step explanation:

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

That is ,

\frac{30}{-3}=\frac{y}{-9}.

Cross multiply:

30(-9)=y(-3)

Simplify:

-270=-3y

Divide both sides by -3

\frac{-270}{-3}=y

90=y

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