помогите решить

1 {3x+4y=0

{2x+3y=1

2 {4x-3y=7

{5x+2y=26

3 {3x-5y=0

{8y-5x=-1

1

{3x+4y=0

{2x+3y=1

{3x+4y=0

{x = (1-3y) / 2

3 (1-3y) / 2+4y=0

3 (1-3y) + 8y = 0

3 - 9y + 8y = 0

y = 3

x = (1-3y) / 2 = (1-9) / 2=-4

2

{4x-3y=7

{5x+2y=26

{x = (3y+7) / 4

{5 (3y+7) / 4+2y=26

{x = (3y+7) / 4

{5 (3y+7) + 8y=104

{x = (3y+7) / 4

{15y+35+8y=104

{x = (3y+7) / 4

{23y=104-35=69

{x = (3y+7) / 4

{y=3

x = (3*3+7) / 4=4

3

{3x-5y=0

{8y-5x=-1

{x=5y/3

{8y-5x=-1

{x=5y/3

{8y-5*5y/3=-1

{x=5y/3

{24y-25y=-3

{x=5y/3

{y=3

x=5y/3=5*3/3=5