Решите систему методом подставки:
4y-x=11
5x-2y= 17

4y - x = 115x - 2y = 174y - 11 = x5x - 2y = 17x = 4y - 115(4y - 11) - 2y = 1720y - 55 - 2y = 1718y = 72y = 4 x = 4*4 - 11x = 5x = 5y = 4