\left \{ {{y=-7+3x} \atop {2x+3y=1}} \right.\\\\2x+3(-7+3x)=1\\x=2\\y=-7+3*2\\y=-1" alt="\left \{ {{3x-y=7} \atop {2x+3y=1}} \right. => \left \{ {{y=-7+3x} \atop {2x+3y=1}} \right.\\\\2x+3(-7+3x)=1\\x=2\\y=-7+3*2\\y=-1" align="absmiddle" class="latex-formula">
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