Question

If x varies directly as y, and x=4 when y=15, find x when y=36.​

Answer 1

Answer:

x = 9.6

Step-by-step explanation:

Given that x varies directly as y then the equation relating them is

x = ky ← k is the constant of variation

To find k use the condition x = 4 when y = 15

k = $\frac{x}{y}$ = $\frac{4}{15}$

x = $\frac{4}{15}$ y ← equation of variation

When y = 36, then

x = $\frac{4}{15}$ × 36 = $\frac{144}{15}$ = 9.6