Question

A) { 6x+y=2
{5x+2y=11
B) {5x-y=34
{3x-4y=0

C) {3x-y=0
{-x+4y=22

Answer 1

segue em foto a resolução

Answer 2

A ) 6 x + y = 2 ( - 2 )
5 x + 2 y = 11
-12 - 2 y = -4
5 x + 2 y = 11
- 7 x = 7 ( - 1 )
x = 1
y = 2 - 6
y = - 4

B ) 5 x - y = 34 ( - 4 )
3 x - 4 y = 0
- 20 x + 4 y = - 136
3 x - 4 y = 0
- 17 x = -136 ( - 1 )
$\frac{-136}{-17}$ ( - 1 )
x = 8
-y = 34 - 40
-y = - 6 ( -1 )
y = 6 

C ) 3 x - y = 0 ( 4 )
- x + 4 y = 22
12 x - 4 = 0
- x + 4 y = 22
11 x = 22
x = $\frac{22}{11}$
x = 2
- y = 0 - 6
- y = -6 ( - 1 )
y = 6