Question 987443: It is given that y varies directly as (x^(1/2)).If x is decreased by 64%, find the percentage change in y.
Above is the question, i tried many things to solve but i couldnt solve it.Hope you will solve it.
Thank you for your kind attention.
Looking forward for your reply.
Found 2 solutions by macston, josgarithmetic:
Answer by macston(5194)   (Show Source):
You can put this solution on YOUR website! .
y varies directly as 
x decreases 64%, leaving 36% of x.
.
For a 64% decrease in x, we get a 40% decrease in the square root of x.
So when y varies directly as the square root of x, for a 64% decrease in x we have a 40% decrease in y.
.
CHECK:
Select any values:
If x=100 then sqrt(x)=10, decreases by 64%, x=36 and sqrt(x)=6
Before, sqrt(x)=10, after sqrt(x)=6, a 40% decrease.
.
If x=169 then sqrt(x)=13, decrease by 64%, x=60.84 and sqrt(x)=7.8
Before, sqrt(x)=13, after sqrt(x)=7.8, a 40% decrease.
.
If x=4 then sqrt(x)=2, decrease by 64%, x=1.44 and sqrt(x)=1.2
Before, sqrt(x)=2, after sqrt(x)=1.2, a 40% decrease.
Answer by josgarithmetic(39618)  (Show Source):
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