SOLUTION: Y varies directly with x. Y =54 when x=9. Determine the direct variation equation and then determine y when x = 3.5

Algebra ->  Finance -> SOLUTION: Y varies directly with x. Y =54 when x=9. Determine the direct variation equation and then determine y when x = 3.5       Log On


   

Question 1170749: Y varies directly with x. Y =54 when x=9. Determine the direct variation equation and then determine y when x = 3.5
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
y=kx
54=k*9
k=6
use that in the second part
y=6x
y=6*3.5
=21