Question 984332: x + y = 0
x - y + 2 = 0
This is really confusing me! I get that x=0 and y=0. Is this right? If not then what is correct? How would I graph it? Very urgent. Can you help me right now? My email is lifeisgood4a@cotc.net
Thank you!
Found 3 solutions by macston, Fombitz, solver91311:
Answer by macston(5194)   (Show Source):
You can put this solution on YOUR website! .
x+y=0 (red line on graph)
x=-y
.
x-y+2=0 Substitute for x. (green line on graph)
-y-y+2=0
-2y=-2
y=1
.
x=-y
x=-1
.
ANSWER:(-1,1)
Answer by Fombitz(32388)  (Show Source):
Answer by solver91311(24713)  (Show Source):
You can put this solution on YOUR website!
What makes you think that  and  ?  could be 100 Billion if  is negative 100 Billion from the first equation alone, and the second equation tells you that they can't both be zero because that would mean that  which would mean that  which would cause a catastrophic rip in the space-time continuum. I don't think you want to be responsible for the utter destruction of the universe, do you?
Put both equations into standard form, that is: 
Now, just since you have two of the same variable with opposite signs, you can add the two equations and eliminate the variable altogether.  ,  , and  , hence:
which is to say:
You should be able to handle discovering the value of from here. Once you know you can substitute that value into either of your original equations and then solve for .
Be careful. The fate of the universe is in your hands.
John
My calculator said it, I believe it, that settles it
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