Question

In a direct variation, y=18 when x=9. Write a direct variation equation that shows the relationship between x and y

Answer 1

Answer:

y = 2x

Step-by-step explanation:

since x and y vary directly then the equation is

y = kx ← k is the constant of variation

to find k use the given condition y = 18 when x = 9

k = $\frac{y}{x}$ = $\frac{18}{9}$ = 2, hence

y = 2x ← is the equation relating x and y