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1) 3x - 4y = 13
2) x + 6y = - 3
Despejo x en 2
x + 6y = - 3
x = - 3 - 6y
Sustituyo x en 1.
3x - 4y = 13
3 (- 3- 6y) - 4y = 13
- 9 - 18 - 4y = 13
- 18y - 4y = 13 + 9
- 22y = 22
y = 22/-22
y = - 1
Sustituyo el valor de y en el despeje de x
x = - 3 - 6y
x = - 3 - 6 (- 1)
x = - 3 + 6
x = 3
Solución :
x = 3
y = - 1