Question

Решите пожалуйста системное уравнение!!! алгебра 7 класс

Answer 1

$\left \{ {{5x-y=3} \atop {3y+2x=8}} \right.$
$\left \{ {{y=5x-3} \atop {3y+2x=8}} \right.$
$\left \{ {{y=5x-3} \atop {15x-9+2x=8}} \right.$
$15x-9+2x=8$
$17x=17$
$x=1$
$\left \{ {{x=1} \atop {y=2}} \right.$

$\left \{ {{17y-2x=3} \atop {x+11y=18}} \right.$
$\left \{ {{17y-2x=3} \atop {x=18-11y}} \right.$
$17y-36+22y=3$
$39y=39$
$y=1$
$\left \{ {{x=7} \atop {y=1}} \right.$

$\left \{ {6x-3y=12} \atop {8y-6x=3}} \right.$
$\left \{ {{2x-y=4} \atop {4y-3x=1.5}} \right.$
$\left \{ {{y=2x-4} \atop {4y-3x=1.5}} \right.$
$8x-16-3x=1.5$
$5x=17.5$
$x=3.5$
$\left \{ {{x=3.5} \atop {y=3}} \right.$