Y = -17 + 3,4xy = -1,2x + 69
-17 + 3,4x = -1,2x + 693,4x + 1,2x = 69 + 174,6x = 86x = 86 : 4,6x = 860/46x = 430/23
y = -17 + 3,4xy = -17 + 17/5 * 430/23y = -17 + (17*430)/(5*23)y = -17 + (17*86)/23y = 1462/23 - 391/23y = 1071/23
Ответ: (430/23; 1071/23)