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21-12-2017
Mathematics

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find the value of two numbers if their sum is 12 and thier difference is 4

Respuesta :

21-12-2017

x + y = 12
x - y = 4
(12 - 4) : 2 = 4
4 + 4 = 8

x = 8
y = 4
-----------------------
8 + 4 = 12
8 - 4 = 4

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