SOLUTION: Solve the systems of equations by graphing. X+y=4, X+y=-4

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Question 242818: Solve the systems of equations by graphing.
X+y=4,
X+y=-4
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
Solve for y in each equation:
y=-x+4
y=-x-4

Are you allowed to use a graphing calculator? If so, there it is:
graph%28300%2C300%2C-10%2C10%2C-10%2C10%2C-x%2B4%2C-x-4%29+

The lines are quite obviously PARALLEL, so there is NO SOLUTION. Sometimes this is written that the system of equations is INCONSISTENT!

Dr. Robert J. Rapalje, Retired