x=8-3y
2x+6y=16

Table of values for x=8-3y

 x | y
-1 | 3
 5 | 1
11 |-1

Graph of x=8-3y






Table of values for 2x+6y=16  

 x | y
-4 | 4
 2 | 2
 8 | 0

Graph of 2x+6y=16



They are the same line, so they are a dependent system.

So the solution set is infinite, and is this:

{ (8-3y,y) | y ∈ R }

Edwin