Correct Option is:
[tex]\boxed{D. \ y = 8x}[/tex]
Two quantities are proportional if we can write one of them as k times the other. In other words, if x and y represents quantities, then if they stands for a proportional relationship we can write:
[tex]y\propto x \rightarrow y=kx[/tex]
In whose case, we will have a linear function with slope k and that passes through the origin. From the options, the only one that matches our definition is Option D.
So correct Option is:
[tex]\boxed{D. \ y = 8x}[/tex]
Constant of proportionality: https://brainly.com/question/10945121
#LearWithBrainly
