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x=6-3y
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5x-2y=13
5(6-3y)-2y=13
30-15y-2y=13
17=17y
1=y
x=3
1) x + 3y = 6
2) 5x - 2y = 13
Despejamos 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
- 17y = - 17
y = -17/-17
y = 1
El valor de y sustituyo en el despeje de x
x = 6 - 3y
x = 6 - 3 (1)
x = 6 - 3
x = 3
Solución :
x = 3
y = 1