Question

For what value of p are the points(2,1),(p,-1),(-1,3) collinear?

Answer 1

hello


The given points will be collinear if the area of triangle formed by them is zero....
and refer attachment above....
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Answer 2

Answer:

Step-by-step explanation:

If the points are collinear then area of triangle is 0

.........

Ar(triangle) =1/2[2(-1-3)+p(3-1)+-1(1+1)]

0=1/2 cross multiply

0=2×-4+3p-p+-1×2

0=-8+2p+-2

0=-10+2p

To change negative bring -10 on the other side

10=2p

P=10/2=5

P=5

Hope this helps you