Question

sistema linear x+y=3 x-y=1

Answer 1

x + y= 3
x - y = 1

Some as duas equações:

2x = 4 ⇔x = 4/2 ⇔x = 2

x + y = 3 ⇔ 2 + y = 3 ⇔ y = 3 - 2 ⇔ y = 1 

S = {(2,1)}

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02/12/2015
Sepauto - SSRC
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Answer 2

$\left \{ {{y=2} \atop {x=2}} \right.$