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-2X - 3Y = -5 (2)
(1)x2: 6X + 4Y = 20
+(2)x3:-6X - 9Y = -15
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-5Y = 5
-5Y = 5, Y = -1
En (1) 3X = 10 - 2Y
3X = 10 - 2(-1)
3X = 12
X = 4
Rta: X = 4; Y = -1
2) 4X + 5Y = -14 (1)
-3X +7Y = -11(2)
(1)x3: 12X + 15Y = -42
+(2)x4:-12X + 28Y = -44
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43Y = -86
43Y = -86
Y = -2
Reemplazo en (1)
4X + 5Y = -14
4X = -14 - 5Y
4X = -14 -5(-2)
4X = -14 + 10
4X = -4
X = -1
Rta: X = -1; Y = -2
3) 2X + Y = 10 (1)
-3X - 2Y = -16(2)
(1)x2: 4X + 2Y = 20
+(2): -3X - 2Y = -16
--------------------------------
X = 4
X = 4
2X + Y = 10
Y = 10 - 2X
Y = 10 - 2(4)
Y = 10 - 8
Y = 2
Rta: X = 4; Y = 2