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1) x + 3y = 5
Despejo x en 2.
x + 3y = 5
x = 5 - 3y
Sustituyo x en 1.
3x - 2y = 4
3 (5 - 3y) - 2y = 4
15 - 9y - 2y = 4
- 11y = 4 - 15
- 11y = - 11
y = -11/-11
y = 1
Sustituyo y = 1 en el despeje de y.
x = 5 - 3y
x = 5 - 3 (1)
x = 5 - 3
x = 2
Solución :
x = 2
y = 1