Question

[2x+7y-44=0
[2x-3y=-36

Answer 1

2х + 7у - 44=0
2х - 3у= -36

2х + 7у - 44=0
10у = 80
у = 8

подставляем:

2х+56-44=0
2х+12=0
2х=-12
2х = -6

-12+56-44=0
44-44=0
0=0
ч.т.д.