Question

Suppose y varies directly with x and y = 72 when x = 6. What direct variation equation relates x and y? What is the value of y when x = 10?

Answer 1

y=kx is direct varaitoin
72=6k
divide both sides by 6
12=k

y=12x is the equation

when x=10
y=12(10)
y=120

equation is y=12x
when x=10, y=120

Answer 2

I guess the slope is y/x=72/6=12. SO when x=10 y=12(10)=120.