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1) x + 3y = 6
2) 5x + 2y = 13
Despejo x en ecuación 1
x + 3y = 6
x = 6 - 3y
Sustituyo el despeje de x en ecuación 2
5x + 2y = 13
5 (6 - 3y) + 2y = 13
30 - 15y + 2y = 13
- 15y + 2y = 13 - 30
- 13y = - 17
y = - 17/-13
y = 17/13
El valor de y sustituyo en el despeje de x
x = 6 - 3y
x = (6 - 3 (17/13))
x = 6 - 51/13
x = (6 * 13 - 51)/13
x = (78 - 51)/13
x = 27/3
El valor de x es 27/13
El valor de y es 17/13