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2) 3x + 2y = 11
2x + 2y = 8
2x = 8 - 2y
x = (8 - 2y)/2
x = 8/2 - 2y/2
x = 4 - y
3x + 2y = 11
3(4 - y) + 2y = 11
12 - 3y + 2y = 11
- 3y + 2y = 11 - 12
- y = -1 ►Multiplicas todo por (-)
y = 1
Y reemplazas en la primera ecuación donde y = 1.
x = 4 - y
x = 4 - 1
x = 3