Question

Which of the following functions shows a directly proportional relationship?

f(x) = 3x + 12
f(x) = 3x
f(x) = 3/ x
f(x) = 3^x + 12

Answer 1

f(x) = 3x

Answer 2

thanks:))

Answer 3

Directly proportional means you are just multiplying a variable by a constant number, like 3.

Answer 4

In most cases, directly proportional means linear, positive slope, and going through the origin. I would say f(x)=3x is the only one that meets those specification