[Solution Library] Solve by substitution method: x+3y=2 , -x+y=1
Question: Solve by substitution method:
\[\begin{aligned} & x+3y=2 \\ & -x+y=1 \\ \end{aligned}\]
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[Step-by-Step] Solve by the addition method x+y=13 , 22x+36y=356
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