Question

Решите систему уравнений:
2x-3y+5=2(3x-y)
5-(4y+16)=x-2y

Answer 1

$left { {{2x-3y+5=2(3x-y)} atop {5-(4y+16)=x-2y}} right. left { {{-4x-y = -5} atop {-x-2y=11}} right. - left { {{-4x-y = -5 |*2} atop {-x-2y=11}} right. 2*( - 4x - y) - ( - x - 2y) = 2*( - 5) - 11 - 7x = - 21 x = 3 - 4(3) - y = 5 y = - 7 (3 ; - 7)$