Question

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Answer 1

$\left \{ {x-3y=-1} \atop {5(x-y)-3(2x=y)=-21}} \right.$

$\left \{ {{x-3y=-1} \atop {5x-5y-6x+3y=-21\\}} \right.$

$\left \{ {{x-3y=-1} \atop {-x-2y=-21}} \right.$

$\left \{ {{x-3y=-1} \atop {x+2y=21\\}} \right.$

x=3y+1

3y+1+2y=21

5y=20

y=4

Тоді x=3*4+1= 13