Question

Find the value on x for which the points (x,-1) , (2,1) (4,5) are collinear

Answer 1

Answer:

1/2( x 2 4 x

-1. 2 4. -1) = 0

1/2( 2x+8-4) -(-2+8+4x) = 0

1/2 (2x+4)-(6+4x)=0

1/2(2x+4-6-4x)=0

1/2(-2x-2)=0

_2x-2=0

-2x=2

x=2/-2

x=-1