(1.25, 2.5) and (3.75, 7.5) do these points represent a proportional relationship

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!