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find an equation of direction variation, given that y varies directly with x and y is 39 when x is 3.

a. y = 42x
b. y = 1/13x
c. y = 117x
d. y = 13x

D) y = 13 x

Step-by-step explanation:

y varies directly to x that is

y∝x

y= k x

where k is constant

k = y/x

if y = 39 and x= 3 then putting values we get

k = 39 / 3

k = 13

putting values of k in the equation where  y = kx

y = 13 x

14

step-by-step explanation: