Question

what is the value of a so that point (a,2),(-5,8)and (-2,4)are collinear

Answer 1

Answer:

Given that the points (a,2),(-5,8) and (-2,4) are collinear, we have

(8-2)/(-5-a)=(4-8)/(-2+5)

6/(-5-a)= -4/3

(6×3)/-4= -5-a

18/-4= -5-a

-9/2+5=-a

(-9+10)/2=-a

1/2= -a

a= -1/2