Question

If y varies directly as x, and y is 18 when x is 5, which expression can be used to find the value of y when x is 11?

Answer 1

Y=kx is the direct variation equation
First plug in the x, y values given to find K
18=k(5)
18/5=k
3.6 = k
Use the k and write a new equation.
y=3.6x
Plug in the x value to solve for y.
y = 3.6(11)
y= 39.6