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Ordenamos las ecuaciones.
1) 4x - 3y = 6
2) x + y = 5
Despejo x en 2.
x + y = 5
x = 5 - y
Sustituyo x en 1.
4x - 3y = 6
4 (5 - y) - 3y = 6
20 - 4y - 3y = 6
20 - 7y = 6
- 7y = 6 - 20
- 7y = -14
y = -14/-7
y = 2
Sustituyo y = 2 en el despeje de x.
x = 5 - y
x = 5 - 2
x = 3
Solución :
x = 3
y = 2