What is a if points (1,3),(2,1),(a,a-4) coliniars ?

Asked on by luvgoj

1 Answer | Add Yours

aruv's profile pic

aruv | High School Teacher | (Level 2) Valedictorian

Posted on

A(1,3) ,B(2,1) and C(a,a-4)

If A,B and C are colinear then area of triangle formed by ABC s zero.

`arDelta ABC=(1/2)|[1,3,1],[2,1,1],[a,a-4,1]|=0`







Thus A(1,3),B(2,1) and C(3,-1) are colinear

We’ve answered 320,053 questions. We can answer yours, too.

Ask a question