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