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1) 3x + y = 1
2) - 4x - 3y = 7
Despejo y en 1.
3x + y = 1
y = 1 - 3x
Sustituyo y en 2.
- 4x - 3y = 7
- 4x - 3 (1 - 3x) = 7
- 4x - 3 + 9x = 7
- 4x + 9x = 7 + 3
5x = 10
x = 10/5
x = 2
Sustituyo x = 2 en el despeje de y.
y = 1 - 3x
y = 1 - 3 (2)
y = 1 - 6
y = - 5
Solución :
x = 2
y = - 5