Question

If points A(1,2) , O(0,0) and C (a,b) are colliinear then

Answer 1

give collinear so
1/2 ×{1×{0-b}+a{2-0}}
-b+2a=0
2a=b

Answer 2

Answer:

give collinear so

1/2 ×{1×{0-b}+a{2-0}}

-b+2a=0

2a=b