Which of the following equations represents a proportional relationship?

Answer:The correct option is 2. The proportional relationship represented by the equation y=12.5x.Step-by-step explanation:If y and x shows a proportional relationship, then[tex]y\propto x[/tex][tex]y=kx[/tex]Where, k is constant of proportionality.First equation is[tex]y=3x^2[/tex]It does not represents a proportional relationship.Second equation is[tex]y=12.5[/tex]It represents a proportional relationship. So, option 2 is correct.Third equation is[tex]x+y=3[/tex][tex]y=3-x[/tex]It does not represents a proportional relationship.Fourth equation is[tex]y=4x-1[/tex]It does not represents a proportional relationship.Therefore correct option is 2. The proportional relationship represented by the equation y=12.5x.