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1) x + 4y = 14
2) x - 3y = - 7
Despejo x en 1.
x + 4y = 14
x = 14 - 4y
Sustituyo x en 2.
x - 3y = - 7
14 - 4y - 3y = - 7
14 - 7y = - 7
- 7y = - 7 - 14
- 7y = - 21
y = -21/-7
y = 3
Sustituyo y = 3 en el despeje de x.
x = 14 - 4y
x = 14 - 4 (3)
x = 14 - 12
x = 2
Solución :
x = 2
y = 3