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Y + X = 8 (1)
X - Y = 2 (2)
En 2: X = 2 + Y
Reemplazo en 1: Y + (2 + Y) = 8
Y + 2 + Y = 8
2Y + 2 = 8
2Y = 8 - 2; 2Y = 6; Y = 3
X = 3 + 2; X = 5
Rta: X = 5; Y = 3
B)
3a - 5m = -16 (1)
2a + 3m = 21 (2)
La (1)x-2: -6a + 10m = + 32
La (2)x3: 6a + 9m = 63
(1)x-2: -6a + 10m = 32
+(2)x3: 6a + 9m = 63
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19m = 95
m = 95/19
m = 5
Ahora en (2)
2a + 3m = 21
2a + 3(5) = 21
2a + 15 = 21
2a = 21 - 15
2a = 6
a = 3
Rta: a = 3; m = 5
C)
5X - 3Y = -5 (1)
2X + 4Y = 24 (2)
La (1)x4: 20X - 12Y = -20
La (2)x3: 6X + 12Y = 72
(1)x4: 20X - 12Y = -20
+(2)x3: 6X + 12Y = 72
-----------------------------
26X = 52
X = 52/26
X = 2
Ahora en (1)
5X - 3Y = -5
5(2) - 3Y = -5
10 + 5 = 3Y
15 = 3Y; Y = 15/3: Y = 5
Rta: X = 2; Y = 5
D)
X + Y = 5 (1)
2X + 3Y = 13 (2)
En (1): X = 5 - Y
Reemplazo el valor de X = 5 - Y, en 2X + 3Y = 13
2(5 - Y) + 3Y = 13
10 - 2Y + 3Y = 13
10 + Y = 13
Y = 13 - 10
Y = 3
Ahora X = 5 - Y
X = 5 - 3
X = 2
Rta: X = 2; Y = 3