Answer:
B
Step-by-step explanation:
A proportional relationship is represented by linear function with its linear parameter "b" equal to zero. Since b is equal to zero, the line passes through the origin and the function/relation is proportional.
To verify that we divide the y coordinate over the x coordinate we obtain a constant called k, which is the slope.
For instance:
[tex]y=2x[/tex]
According to this function we can easily check a proportional relationship among its points:
[tex] (1,2), (2,4), (4,8), (6,12), ...[/tex]
[tex]k=\frac{y}{x}=\frac{2}{1}=\frac{4}{2}=\frac{12}{6}\Rightarrow k=2[/tex]
