How can x2+3x+1=2x2+2x+3 be set up as a system of equations

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