Question

In a direct variation, y = 20 when x = 4. Write a direct variation equation that shows therelationship between x and y.Write your answer as an equation with y first, followed by an equals sign.Submit

Answer 1

if y=20 when x=4, there must be a proportionality constant between the numbers.

$20=k\cdot(4)$

find k

$\begin{gathered} k=\frac{20}{4} \\ k=5 \end{gathered}$

rewrite the expression in terms of x and y

$y=5x$