Answer
$\{(x,y)|x=4-2y\}$
Work Step by Step
1. Simply the second equation, divide by 2 to get $x+2y=4$
2. We can see the above is the same as the first equation.
3. We conclude that the two equations are dependent and we can write the solution as $\{(x,y)|x=4-2y\}$ where $y$ can be any real number.