For this case we can write the system of equations as two equations with two unknowns. We then define the following unknowns: incognitas: x and y. We write the system of equations: y = x2 + 3x + 1 y = 2x2 + 2x + 3 Answer: y = x2 + 3x + 1 y = 2x2 + 2x + 3