Find the slope of the line containing the points (3,8) (1,8)

The answer is zero. 8-8=0. 3-1=2. 2/0 equals 0

Hi 

slope of a line accordind to two point form is given by

tan∅=y₂-y₁/x₂-x₁

∴ tan∅=8-8/1-3

⇒ tan∅ = 0

∴∅=0°

hence the line lies in the x axis.

1.17+3.99a. you combine the terms with a to create 3.99 and the 1.17 stays because it has no like terms or a variable