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The variable y is directly proportional tot he variable x. if y=9 when x= 5 what is the value of y when x =20

User Steveayre
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1 Answer

4 votes

Answer:

Explanation:

y is directly proportional to the variable x, so


y=kx

Sub in y=9, x=5 to find k:


9=5k \rightarrow k=(9)/(5)

So we get:


y=(9)/(5) x

Find y when x=20:


y=(9)/(5) x


y=(9)/(5) * 20


=36

SAolution: when x=20, y=36

User Far
by
8.3k points

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