Question

pelo método da substituição

3x+5y=7
2x-3y=11

Answer 1

$\left \{ {{3x+5y=7} \atop {2x-3y=11}} \right.$

x=$\frac{7-5y}{3}$

$2( \frac{7-5y}{3} ) -3y =11$

$\frac{14-10y}{3} -3y =11$

MMC=3

$14 -10y -9y = 33$
$-19y=19$
$y=- 1$

$x= \frac{7-5(-1) }{3}$
$x= \frac{7+5}{3}$
$x= \frac{12}{3}$
$x=4$
                                                   S={(4;-1)}