# SOLUTION: Suppose y varies directly as x and that y=21 when x=3. Find the value of y when x=5.

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 Click here to see ALL problems on Quadratic Equations Question 134116: Suppose y varies directly as x and that y=21 when x=3. Find the value of y when x=5.Answer by jojo14344(1512)   (Show Source): You can put this solution on YOUR website!By Ratio and Proportion; 1st condition; x=3 and y=21 2nd condition; x=5 and y=? so, 3/21 = 5/y y = 5 * 21 /3 y = 35 It is just right to be y=35 (as shown by ratio above)as it varies directly to x. When x goes up, so does y goes up!