Question

$x - y = 3 \\ 2x + y = 9$
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Answer 1

Resposta:

X =

$x - y = 3 \\ 2x + y = 9 \\ = 3x - 2y = 12 \\ 3x = 12 \\ x = 12 \div 3 \\ x = 4$

$x - y = 3 \\ 4 - y = 3 \\ 4 - 3 = y \\ 1 = y$

Y =