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1) 5x + 2y = 79
2) 3x - 4y = - 15
Despejamos x en las dos ecuaciones.
5x + 2y = 79 3x - 4y = - 15
5x = 79 - 2y 3x = - 15 + 4y
x = 79 - 2y x = - 15 + 4y
---------- -----------
5 3
Igualamos mas ecuaciones eliminando x para hallar y.
79 - 2y - 15 + 4y
---------- = --------------
5 3
3 (79 - 2y) = 5 (- 15 + 4y)
237 - 6y = - 75 + 20y
- 6y - 20y = - 75 - 237
- 26y = - 312
y = -312/-26
y = 12
Reemplazo y = 12 en cualquiera de los despejes de x.
-15 + 4y - 15 + 4 (12) - 15 + 48 33
x = ------------ = ------------------- = --------------- =-------- = 11
3 3 3 3
Solución :
x = 11
y = 12