6y2 - 24y - 4y +16 = 7y2 - 28y - 84
6y2 - 24y - 4y - 7y2 +28y = -100
-y2 = -100
y=10
X=13- 2y x=13- 2y
(13-2y) y=15 13y- 2y ^2 -15=0
-2y^2+13y- 15=0
D=169- 120=49
X1/2=- 13-
Х=80у, х=60*(у+12), 80у=60у+720, 20у=720, у=36 мин, х=80*36/60=48 км
(y-y1)/(y2-y1)=(x-x1)/(x2-x1)
(y+2)/-8=(x-1)/-4
y+2=2x-2
y=2x-4