Question

$\left \{ {{2x-y=7} \atop {-x-y=-8}} \right.$

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Answer 1

$\left \{ {{2x-y=7} \atop {-x-y=-8}} \right.$

$\to-y=7-2x$

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$-x-y=-8$

$-x+7-2x=-8$

$-x-2x=-7-8$

$-3x=-15$

$x=\frac{15}{3} =5$

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$2x-y=7$

$2.5-y=7$

$10-y=7$

$-y=-10+7$

$y=3$

x=5 e y=3