1)
{2x-3y=1 {2x-3*(7-3x)=1 {2x-21+9x=1
=> => =>
{3x+y=7 {y=7-3x {y=7-3x
{11x=22 {x=2 {x=2
{y=7-3x {y=7-3*2 {y=1
ответ: (2;1)
2)
{2x+y=1 {y=1-2x {y=1-2x
{5х+2y=0 {5x+2*(1-2x)=0 {5x+2-4x=0
{y=1-2*(-2) {y=5
=> =>
{x=-2 {x=-2
ответ: (-2;5)
3)
{x+y=6 {x=6-y {x=6-y
{5x-2y=9 {5*(6-y)-2y=9 {30-5y-2y=9
{x=6-y {x=6-3 {x=3
{7y=21 {y=3 {y=3
ответ:(3;3)
1)
{2x-3y=1 {2x-3*(7-3x)=1 {2x-21+9x=1
=> => =>
{3x+y=7 {y=7-3x {y=7-3x
{11x=22 {x=2 {x=2
=> => =>
{y=7-3x {y=7-3*2 {y=1
ответ: (2;1)
2)
{2x+y=1 {y=1-2x {y=1-2x
=> => =>
{5х+2y=0 {5x+2*(1-2x)=0 {5x+2-4x=0
{y=1-2*(-2) {y=5
=> =>
{x=-2 {x=-2
ответ: (-2;5)
3)
{x+y=6 {x=6-y {x=6-y
=> => =>
{5x-2y=9 {5*(6-y)-2y=9 {30-5y-2y=9
{x=6-y {x=6-3 {x=3
=> => =>
{7y=21 {y=3 {y=3
ответ:(3;3)