How can x² = x² + 2x + 9 be set up as a system of equations? (1 point)
1. y= x²-9
y = x² + 2x + 9

2. y=x²
y = x² + 2x +9

3. y = x² + 2x
y = x² +9

4. y=x²
y = 2x + 9