Question

Y varies directly as x, and y=7 when x=4, find y when x=12

Answer 1

♥ Lets gather the information we know:

`x = 4 y=7`
♥ Now lets multiply and solve:
if x= 4*3 and 4*3 is 12
if x= 7*3 and 7*3 is 21
♥ And since 7*3=21, our answer is 21

Answer 2

Since y varies with x, the same we do to y, applies to x.

x = 4 y=7

x= 4*3 = 12
x= 7*3 = 21

Therefore, x = 21

Final answer: x=21 and y= 12