Question

PLEASE HELP

Variable y varies directly with x2, and y = 75 when x = 5.



What is the value of y when x = 3?



y =

Answer 1

`y=75\ \ \ \ x=5\\\\ y=?\ \ \ \ \ x=3\\\\ proportion:\\ (75)/(y)=(5)/(3)\ \ \ | cross\ multiplication\\\\ 75*3=5y\\\\ 225=5y\ \ \ | divide\ by\ 5\\\\ y=45`