Use addition to solve the linear system of equations. Include all of your work in your final answer. x-y=4 x+2y=4

x = 4 , y = 0

Step-by-step explanation:

x -    y = 4 ( 1 )  

x + 2y = 4 ( 2 )

( 1 ) x - 1 => - x + y = - 4  ( 3 )

( 2 )      =>    x + 2y = 4   ( 2 )

( 2 ) + ( 3 ) => 0 x  + 3y = 0

               => y = 0

Substitute y = 0 in ( 1 ) => x - y = 4

                                  => x - 0 = 4

                                        x = 4