Question

I want only second one.....plzzz give answer as fast as possible...​

Answer 1

Answer:

a = 0

Step-by-step explanation:

If points are collinear, then slope of the line passing through those points for each pair of points are the same.

Slope m = $(y_{2} - y_{1}) / (x_{2} - x_{1})$

~~~~~~~~~~

$m = \frac{4-4}{-2+8}$ = 0

$m = \frac{a-4}{5+2} = 0$  ⇒ a = 0