-3x + y = 3 and 3x + 2y = -12
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\(\color{BrickRed} -3x + y = 3 \\ 3x-y=-3\)
\( 3x + 2y = -12 \)
\(3x=\color{blue}y-3=-2y-12\)
\(3y=-9\)
\(y=-3\)
\(-3x + y = 3\\ 3x=y-3\\ 3x=-3-3\)
\(x=-2\)
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