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1) x + 2y = 0
2) 3x - y = 2
Despejo x en 1
x + 2y = 0
x = - 2y
Sustituyo x en 2
3x - y = 2
3 (- 2y) - y = 2
- 6y - y = 2
- 7y = 2
y = 2/-7
y = - 2/7
El valor de y sustituyo en el despeje de x
x = - 2y
x = - 2 (- 2/7)
x = 4/7
Solución :
x = 4/7
y = -2/7