Question

Y varies directly as x and y = 9 when x = 72

Answer 1

Answer:

y = $\frac{x}{8}$

Step-by-step explanation:

since y varies directly as x, then the equation relating them is

y = kx ← k is the constant of variation

to find k use the given condition y = 9 when x = 72

k = $\frac{9}{x}$ = $\frac{9}{72}$ = $\frac{1}{8}$, hence

y = $\frac{1}{8}$ × x = $\frac{x}{8}$