Respuesta :

pmart

Answer: x = 18 ; y = -18

Step-by-step explanation:

x + y = 19

x - y = 55

x - y = 55

x = 55 + y

55 + y + y = 19

55 + 2*y = 19

2*y = 19 - 55

2*y = -36

y = -36 / 2

y = -18

x + y = 19

x - 18 = 19

x = 19 + 18

x = 37

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