Question

show that the points A(2,-1,3) B(3,-5,1) and C(-1,11,9) are collinear​

Answer 1

use the formula Area of triangle=0

1/2{x1(y2-y3)+x2(y3-y1)+x3(y1-y2)}=0

Answer 2

Answer:

Step-by-step explanation:

Add two digits of points B and C one by one and divide each by 2 if they are equal to pint A then it's collinear