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

y = x2 - 2x + 4

y = x2 + 2x + 4

y = x2

y = x2 + 2x + 4

y = x2 + 2x

y = x2 + 4

y = x2

y = 2x + 4

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