Question

2x-y=3 3x+y=3 modo substituiçao

Answer 1

está aí o procedimento detalhado.

Answer 2

$\left \{ {{2x-y=3} \atop {3x+y=3}} \right.$

$\to y=3-3x$

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$2x-y=3$

$2x-(3 -3x)=3$

$2x-3+3x=3$

$5x=3+3$

$x=\frac{6}{5}$

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$3x+y=3$

$3(\frac{6}{5}) +y=3$

$\frac{18}{5} +y=3$

$y=3-\frac{18}{5}$

$y=\frac{3.5-18.1}{5} =\frac{15-18}{5} =-\frac{3}{5}$