Question

Пожалуйста. Помогите с #1534 (1,2)

Answer 1

1. $\left \{ {{7x=21} \atop {2x-y=1}} \right.    \left \{ {{x=3} \atop {6-y=1}} \right.    \left \{ {{x=3} \atop {y=5}} \right.$
2. $\left \{ {{6x=36} \atop {2x-3y=9}} \right. \left \{ {{x=6} \atop {12-3y=9}} \right.   \left \{ {{x=6} \atop {3y=3}} \right.   \left \{ {{x=6} \atop {y=1}} \right.$