Final answer:
The given equations y = 2x and y = 2x + 15 are not proportional.
Step-by-step explanation:
The given equations are y = 2x and y = 2x + 15. To determine if they are proportional, we need to check if they have the same ratio for every value of x. Subtracting the first equation from the second, we get (y - y) = (2x + 15) - 2x, which simplifies to 0 = 15. Since this equation is not true for all values of x, the equations are not proportional.