y ∝ √x If y = 60 when x = 36 find, x when y = 80
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Given : y is directly proportion to x , and the value of y is 80 .
To Find : the value of x .
Answer : Take a constant K ,
then 60 = k = 6k (dividing both side by 6)
then we will get 10 = K
y = 10
y = 10
when y = 80 , then
80 = 10 ( dividing both sides by 10 )
8 = ( squaring both sides )
64 = x
Hence , the value of x is 64 when y is 80
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