We had the following:
x - 2y = 3 | -3 | -3x + 6y = -9 |
3x - 3y = 3 | 3x - 3y = 3 |
Adding the equations on the right gave us
Substituting y = -2 into the first equation gives
Thus, the solution is (x, y) = (-1, -2)
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