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Evgesh-ka [11]
4 years ago
9

Use the substitution method to solve 3x-5y=-8 and x+2y=1

Mathematics
1 answer:
svp [43]4 years ago
4 0
\boxed{ \left \{ {{3x-5y=-8} \atop {x+2y=1}} \right.} \\ \\ x+2y=1\Rightarrow \boxed{x=1-2y} \\------------- \\  \boxed{\left \{ {{3x-5y=-8} \atop {x=1-2y}} \right. }  \\\\3(1-2y)-5y=-8 \\ 3-6y-5y=-8\\\\3-11y=-8\\\\-11y=-8-3 \\ \\ -11y=-11y \\ \\ \boxed{y=1} \Rightarrow \boxed{x=-1}


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