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

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 = = =

y = x ← equation of variation

when x = 40, then

y = × 40 = 8 → A

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