How can 2x2 = x2 + 4x + 8 be set up as a system of equations?

y = x2 - 4

y = x2 + 2x + 8

y = x2

y = x2 + 4x + 8

y = 2x2

y = x2 + 4x + 8

y = x2

y = 2x + 8

We are asked in the problem to get the linear equations that results to 2x2 = x2 + 4x + 8. In this case, the two equations on each sides can be equal to y in which the two equations are then identical. The systems of equations that has the right answer is C.