Question

If the given point (2,3), (4,9) and (6,-3) are
collinear then find the value of a​

Answer 1

Answer:

Wondering where is 'a'?

Still, here's how to do it...

Step-by-step explanation:

Say, 3 points (P, Q, R) are colinear...

Then, let's join them...

Now, since they are colinear, they won't form a triangle, right?

Or simply, there are will be 0... [Makes sense?]

Now, for a triangle,

Area = (1/2) [x1 (y2 – y3 ) + x2 (y3 – y1 ) + x3(y1 – y2)]  [Which should be = 0]

Now substitute the values in the equation... You'll get a linear equation in 1 variable.

Hope that helps...