Question

Como resolver:
3x+y=19
2X+2X=-6

2X+Y=3
x+2Y=19

Answer 1

3x + y = 19 (*-2)
2x + 2y = -6
-----------------------
-6x - 2y = -38
2x + 2y = -6
-----------------------
-4x = -44
x = 44/4
x = 11

2x + 2y = -6
2(11) + 2y = -6
22 + 2y = -6
2y = -6 - 22
2y = -28
y = -28/2
y = -14

======================================

2x + y = 3 (*-2)
x + 2y = 19 
-------------------------
-4x - 2y = -6
x + 2y = 19
-------------------------
-3x = 13
x = -13/3

2x + y = 3
2(-13/3) + y = 3
-26/3 + y = 3
y = 3 + 26/3
y = 9/3 + 26/3
y = 35/3