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5X + 8Y = -60 (2)
3X = 2Y - 2
X = (2/3)Y - 2/3
5X = -60 - 8Y
X = -60/5 - (8/5)Y
X = X:
(2/3)Y - 2/3 = -60/5 - (8/5)Y
-2/3 + 12 = -(8/5)Y - (2/3)Y
-2/3 + 36/3 = [3(-8Y) + 5(-2Y)]/15
34/3 = [-24Y - 10Y]/15
34/3 = -34Y/15
34x15 = 3(-34Y)
510 = -102Y
Y = 510/-102Y
Y = -5
Reemplazo el valor de Y en (1)
3X - 2Y = -2
3X - 2(-5) = -2
3X + 10 = -2
3X = -2 - 10
3X = -12
X = -12/3
X = -4
Rta: X = -4, Y = -5
1) 3x - 2y = - 2
2) 5x + 8y = - 60
Despejo x en las dos ecuaciones.
3x - 2y = - 2 5x + 8y = - 60
3x = - 2 + 2y 5x = - 60 - 8y
x = (- 2 + 2y)/3 x = (- 60 - 8y)/5
Igualamos las dos ecuaciones y multiplicamos en cruz.
(- 2 + 2y)/3 = (- 60 - 8y)/5
- 10 + 10y = - 180 - 24y
10y + 24y = - 180 + 10
34y = - 170
y = - 170/34
y = - 5
El valor de y lo reemplazo en uno de los despeje de x
x = (- 2 + 2y)/3
x = (- 2 + 2 (- 5))/3
x = (- 2 - 10)/3
x = - 12/3
x = - 4
Respuesta.
x = - 4
y = - 5