Question

Given that y varies directly with x, what is the equation of direct variation if y is 16 when x is 20?

Answer 1

y = kx is the direct variation equation.
First find k, the could variation.
16 = k * 20
Divide both sides by 20.
16/20 = k
4/5 = k
y = 4/5 k is the equation with the given parameters.

Answer 2

The direct variation is "y=kx" . As "x" increases the value of "y" increases in constant rate.