Question

Решите системы уравнений

Answer 1

1.
$\left \{ {{4x-2y=2} \atop {2x+y=5}} \right. \left \{ {{2x-y=1} \atop {2x+y=5}} \right. \\ 4x=6 \\ x= \frac{6}{4}=1.5 \\ 2x+y=5 \\ 3+y=5 \\ y=2$
2.
$\left \{ {{3x-y=-1} \atop {-x+2y=7}} \right. \left \{ {{6x-2y=-2} \atop {-x+2y=7}} \right. \\ 5x=5 \\ x=1 \\ -x+2y=7 \\ -1+2y=7 \\ 2y=6 \\ y=3$