Respuesta :

Answer:

a = 8.5

b = 4.5

Step-by-step explanation:

let 2 number be a ,b

a + b = 13  (1)

a - b = 4    (2)

(1) + (2) = 2a = 13+4 = 17 -> a = 8.5

-> b = 8.5 -4 = 4.5

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