Find y when x=9 if y varies directly as the square of x, and y=100 when x=5.

324

Step-by-step explanation:

Given : y varies directly as the square of x

To Find : Find y when x=9

Solution :

We are given that y varies directly as the square of x

So, ---1

where k is the constant of proportionality

Now we are also given that y=100 when x=5.

Substitute the values in 1

So, equation becomes  

Now substitute  x= 9

Hence The value of y when x is 9 is 324

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