Question

If y varies directly with x and y = 2 when x = 10, then what is the value of y when x = 40? A. 8 B. 45 C. 200 D. 320

Answer 1

Answer:

8

Step-by-step explanation:

Answer 2

Answer:

A

Step-by-step explanation:

given that y varies directly with x then the equation relating them is

y = kx ← k is the constant of variation

to find k use the given condition y = 2 when x = 10

k = $\frac{y}{x}$ = $\frac{2}{10}$ = $\frac{1}{5}$

y = $\frac{1}{5}$ x ← equation of variation

when x = 40, then

y = $\frac{1}{5}$ × 40 = 8 → A