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2X + 5Y = -4 (2)
(2)x-5: -10X - 25Y = 20
(1): 10X - 3Y = 36
+(2)x-5: -10X -25Y = 20
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-28Y = 56
-28Y = 56
Y = 56/-28
Y = -2
Reemplazo el Valor de Y, en (1)
10X - 3Y = 36
10X - 3(-2) = 36
10X + 6 = 36
10X = 36 - 6
10X = 30
X = 30/10
X = 3,
Rta: X = 3, Y = -2
1) 10x - 3y = 36 (5)
2) 2x + 5y = - 4 (3)
50x - 15y = 180
6x + 15y = - 12
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56x + 0y = 168
56x = 168
x = 168/56
x = 3
El valor de x lo reemplazo en ecuación 2
2x + 5y = - 4
2 (3) + 5y = - 4
6 + 5y = - 4
5y = - 5 - 6
5y = - 10
y = - 10/5
y = - 2
Respuesta.
x = 3
y = - 2