Answer:
Option B
[tex]f(x)=\frac{3}{4}x[/tex]
Step-by-step explanation:
we know that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form [tex]k=\frac{y}{x}[/tex] or [tex]y=kx[/tex]
In a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin
In this problem the only linear function that passes through the origin is
[tex]f(x)=\frac{3}{4}x[/tex]
where
The constant of proportionality is k=3/4
