Question

x+y= 17
x-y= 13
Quanto da o restado?

Answer 1

x+y=17⇒ x= 17-y e
x-y=13⇒ x= 13+y   logo

17-y=13+y
-y-y=13-17
-2y=-4

y=2    se  y =2 entao x+y=17
                                 x+2=17
                                 x= 17-2
x=15

Answer 2

Resposta:

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