Решите ! {2x-y=13 {2x+3y=9 {2x+3y=10 {x-2y=-9 {2x+y=-5 - вопрос №25875222132392310292536 от Lapatkoanna 04.09.2021 10:57

Question

Алгебра: Решите ! {2x-y=13 {2x+3y=9 {2x+3y=10 {x-2y=-9 {2x+y=-5 {x-3y+=-6

Lapatkoanna · Answer

{2x-y=13   {2x=13+y
{2x+3y=9 {13+y+3y=9 4y=-4 y=-1 x=6

{2x+3y=10   {2x+3y=10    {2(-9+2y)+3y=10 -18+4y+3y=10 7y=28 y=4
{x-2y=-9   {x=-9+2y x=-1

{2x+y=-5   {2x+y=-5   {2(-6+3y)+y=-5 -12+6y+y=-5 7y=7 y=1
{x-3y=-6   {x=-6+3y x=-3