Question

If y varies directly as x and x= 8 when y=5, what is y when x = 9?

Answer 1

if y varies directly with x, it means y equals some constant times x, i.e.:\[y=kx\]where k is a constant.
So use the first two values (x=8, y=5) to find k, then use this to find the value of y when x=9.

Answer 2

thanks

Answer 3

yw