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ecuacion 1: x +3y = 5
ecuacion 2: 2x -3y = -1
Despejemos x en la ecuacion 1
x= 5 -3y
Sustituimos x en la ecuacion 2
2(5-3y) -3y = -1
Realizamos las operaciones
10 -6y -3y = -1
10 -9y = -1
-9y = -1 -10
-9y = -11
y = -11/-9
y = 11/9
Ahora despejamos y en la ecuacion 1 para encontrar el valor de x
x +3(11/9) = 5
x + 33/9 = 5
x= 5 -33/9
x = 45/9 -33/9
x= 12/9
x= 4/3
Comprobando si x = 4/3 y y = 11/9
ecuacion 1: x +3y = 5
4/3 + 3(11/9) = 5
12/9 + 33/ 9 = 5
45/9 = 5
5= 5
ecuacion 2: 2x -3y = -1
2(4/3) - 3(11/9) = -1
8/3 -33/9 = -1
24/9 -33/9 = -1
-9/9 = -1
-1= -1