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X – y = 19
Podemos sumarlas y eliminamos la incógnita "y"
2X = 85 + 19
104
X= --------- = 52 ⇒ x = 52
2
sustituimos el valor hallado de x
52 + y = 85
Y = 85 – 52 ⇒ Y = 33
Comprobamos
X + y = 85 52 + 33 = 85
X – y = 19 52 – 33 = 19