Question

find the value of k for which the points (8,1),(k,-4),(2,-5) are collinear

Answer 1

formula for collinear is

y1-y2/x1-x2=y1-y3/x1-x3

-4-[-5]/8-k=1-[-5]/8-2

-4+5/8-k=6/6

1/8-k=6/6

6=6[8-k]

1=8-k

-7=-k

7=k