Respuesta :

Anisatunizzati

Answer:

x = a/2 - b/2

y = a/2 + b/2

Step-by-step explanation:

x + y = a

x + b = y

x - y = -b

x + y = a

x - y = -b

________--

2y = a + b

y = a/2 + b/2

x + y = a

x - y = -b

________+

2x = a - b

x = a/2 - b/2

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