Given the system of linear equations. x = y + 4 y = -2x - 4 part a: solve the linear system of equations by graphing part b: use substitution to solve the linear system of equations part c: use addition to solve the linear system of equations in your final answer, include all of your work, the graph of the equations and the solution.

A) See the graph below.
The solution is (x, y) = (0, -4).

b) Substituting for x, you have
.. y = -2(y+4) -4
.. y = -2y -12
.. 3y = -12
.. y = -4
.. x = y +4 = -4 +4 = 0
The solution is (x, y) = (0, -4).

c) Add the two equations.
.. (x) +(y) = (y +4) +(-2x -4)
.. x +y = y -2x . . . . . . . . . . . . eliminate parentheses
.. 3x = 0 . . . . . . . . . . . . . . . . add 2x -y
.. x = 0
.. y = -2x -4 = -2*0 -4 = -4
The solution is (x, y) = (0, -4).