Question

$3x + y = 1 \\ 2x - y = 2$
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Answer 1

Olá.

Resolução:

{3x + y = 1

{2x - y = 2

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5x = 1 + 2

5x = 3

x = 3/5

Para "y" :

2x - y = 2

2(3/5) - y = 2

6/5 - y = 2

y = 2 - 6/5 = (6-10)/5 = -4/5