Question

Show that the three points are collinear A(-3,-4),B(7,2),C(12,5)?​

Answer 1

Answer:

if the points are collinear ,so the area of the triangle made by the three points is zero

-3 , -4

7 , 2

12 , 5

-3 , -4

=1/2(-6+28+35-24+-48+15)

=1/2(78-78)

=0

so the points are collinear