Put both equation in standard form Ax + By = C
3x - 3y = -3 ← -2×(3x - 3y = -3) → - 6x + 6y = 6
2x - 6y = 2 → now y-terms are opposites 2x - 6y = 2
add -4x = 8
divide by -4 x = -2
plug x value into one of the equations 3(-2) + 3 = 3y and solve
-6 + 3 = 3y
-3 = 3y
-1 = y
Answer: (-2, -1)