Question

решите систему линейных уравненийx-3y= -45x+2y= -3

Answer 1

$\left \{ {{x-3y=-4} \atop {5x+2y=-3}} \right.$

$\left \{ {{x=3y-4} \atop {15y-20+2y=-3}} \right.$ 

$\left \{ {{x=3y-4} \atop {17y=17}} \right.$

$\left \{ {{x=3y-4} \atop {y=1}} \right.$ 

$\left \{ {{x=-1} \atop {y=1}} \right.$ 

Answer 2

5x-15y=-20

5x+2y=-3

-17y=-17

y=1

x=-4+3y=-1 x=-1