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Y is in direct proportion to x. If x = 25 than y = 5. Find the value of y, if x = 9.

User Damani
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1 Answer

5 votes

Given

y is in direct proportion to x.

And, if x = 25 then y = 5.

To find the value of y if x=9.

Step-by-step explanation:

It is given that,

y is in direct proportion to x.

Then,


\begin{gathered} y\propto x \\ y=kx\text{ \_\_\_\_\_\lparen1\rparen} \end{gathered}

Since, x=25 and y=5.

Then,


\begin{gathered} 5=k(25) \\ k=(5)/(25) \\ k=(1)/(5) \end{gathered}

Therefore,


y=(1)/(5)x

That implies, for x=9.


\begin{gathered} y=(1)/(5)(9) \\ y=(9)/(5) \\ y=1.8 \end{gathered}

Hence,


y=1.8

User Skgbanga
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