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Answer:
Equation 1: x + 3y = 17
Equation 2: -x + 2y = 8
Add Equation 2 to Equation 1:
x + 3y = 17
+ -x + 2y = 8
5y = 25
Divide both sides by 5:
[tex]\sf \implies \dfrac{5y}{5}=\dfrac{25}{5}[/tex]
[tex]\sf \implies y=5[/tex]