SOLUTION: 3x-4y=9 -3x+4y=12 Solve system with addition method. IS this independant, dependant or inconsistant?

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Question 146218: 3x-4y=9
-3x+4y=12 Solve system with addition method. IS this independant, dependant or inconsistant?
Answer by nabla(475) About Me  (Show Source):
You can put this solution on YOUR website!
Add them to get:
0+0=21
Does 0=21????? No
It is inconsistent.