Question

Rezolvați sistemul:
-2x + 3y = 11
7x + y = -4

Answer 1

$\left \{ {{-2x + 3y = 11} \atop {7x + y = -4}} \right. =>\\\left \{ {{-2x + 3y = 11} \atop {y=-4-7x}} \right. =>\\\left \{ {{-2x+3(-4-7x)=11} \atop {y=-4-7x}} \right. =>\\\left \{ {{-2x-12-21x=11} \atop {y=-4-7x}} \right. =>\\\left \{ {{-23x=23} \atop {y=-4-7x}} \right. =>\\\left \{ {{x=-1} \atop {y=-4-7x=-4+7=3}} \right.$

Bafta!