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2) 2x + 5y = 16
Despejo x en las dos ecuaciones.
2x + y = 15 2x + 5y = 16
2x = 15 - y 2x = 16 - 5y
x = (15 - y)/2 x = (16 - 5y)/2
Igualamos las ecuaciones y multiplicamos en cruz.
(15 - y)/2 = (16 - 5y)/2
30 - 2y = 32 - 10y
- 2y + 10y = 32 - 30
8y = 2
y = 2/8
y = 1/4
El valor de y reemplazo en uno de los despeje de x
x = (15 - y)/2
x = (15 - 1/4)/2
x = (- 1 + 60)/4/2
x = 59/4/2/1
x = 59/8
x = 59/8
y = 1/4