Question

Алгебра 7 класс. Плз

Answer 1

$\left \{ {{6x-4y=3} \atop {-3x+2y=4}} \right.$
$6(4-2y)-4y=3$
$24-12y-4y=3$
$-16y=-18$
$y=1.125$
$-3x+2.25=4$
$-3x=4-2.225$
$-3x=1.775$


$\left \{ {{3x-9y=3} \atop {2x+3y=5}} \right.$
$3(5-3y)-9y=3$
$15-9y-9y=3$
$-18y=-12$


$\left \{ {{5x-9y=-24} \atop {-4x+3y=-6}} \right.$
$5(-6-3y)-9y=-24$
$-30-15y-9y=-24$
$-24y=6$
$y=-0.25$
$-4x-0.75=-6$
$-4x=-6+0.75$
$-4x=-5.25$
$x=1.3125$