<span>х:1 целую 3/5=3 целых 2/7 :2 целых 22/35</span>
{ 5x - 4y = 13
{ 2x - y = 4
{ x = 13/5 + 4/5y
{ 2x - y = 4
2 ( 13/5 + 4/5y ) - y = 4
y = - 2
2x - ( - 2 ) = 4
x = 1
( x, y ) = ( 1, -2 )
{ 5 * 1 - 4 * ( - 2 ) = 13
{ 2 * 1 - ( - 2 ) = 4
{ 13 = 13
{ 4 = 4
( x, y) = ( 1, -2 )
Ответ: (1; -2)