Se resuelve por el método de sustitución
x+y=4
2x-3y=3
x+y=4
2x-3y=3
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(2) 2x -3y =3
Despejamos y de (1)
y = 4-x
Reemplazamos en (2)
2x -3(4-x)=3
2x -12-3x =3
-x =3+12
x= -15
y = 4--15= 19