Answer: First option.
Step-by-step explanation:
The equation of a line that passes through the origin (which is the point [tex](0,0)[/tex]), has the following form:
[tex]y=mx[/tex]
Where "m" is the slope of the line.
By definition, Proportional relationships have this form:
[tex]y=kx[/tex]
Where "k" is the Constant of proportionality.
Therefore, the graph of a Proportional relationship is a straight line that passes through the origin; then:
[tex]m=k[/tex]
Observe the equations provided in the exercise's options.
In this case you can identify that the only equation that has the form [tex]y=kx[/tex] explained before, is the first one:
[tex]y=14x[/tex]
And the Constant of proportionality is:
[tex]k=14[/tex]
