268) x = -2.5 y = 0.5

x = -1.5 y = -0.5

x = 0 y = 0

x = 1.5 y = 1.5

x = 2 y = 2

y = -0.5  x = -0.5 и x = -1.5

y = 1  x = 1 и x = -3

y = 2.5  x = 2.5

269) x = -1.5 y = -0.3

x = 0 y = 1.8

x = 4  y = 3

x = 5.5 y = 1.5

y = -2.5 x = 35/6

y = 0 x = 5 и x = -9/7

y = 4.5  x = 27/14 и x = 3.5