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Metodo de reduccion.
x + 4y = 21 (1)
x + 3y = 14 (2)
Se multiplica (1) por - 1
(x + 4y = 21)(-1) =
- x - 4y = - 21 Le sumamos (2)
x + 3y = 14
-------------------
y = 7
Reemplazas el valor y = 7 en (2)
x + 3y = 14
x = 14 - 3y
x = 14 - 3(7)
x = 14 - 21
x = - 7
Solucion.
(- 7 , 7)