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5x - y = 3
-2x + 4y = -12
1. Suprimimos una variable:
5x - y = 3 (4)
-2x + 4y = -12
↓
20x - 4y = 12
-2x + 4y = -12
2. Restamos y resolvemos la ecuación:
20x - 4y = 12
-2x + 4y = -12
-----------------------------
18x = 0
x = 0/18
x = 0
3. Sustituimos el valor de "x" en la segunda ecuación inicial.
-2x + 4y = -12
-2(0) +4y = -12
0 + 4y = -12
4y = -12
y = -12/4
y = -3
4. Solución:
x = 0 ; y = -3
Espero que te ayude.
Saludos!!!