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Question 319294: x+y=3
x-y=4
Answer by nyc_function(2741)   (Show Source):
You can put this solution on YOUR website! Notice right away that both y letters cancel each other out because one is positive and the other is negative.
So, we are left with 2x = 3 + 4 or 7.
Solve 2x = 7 for x.
x = 7/2
The only solution to this system of linear equations is the point (7/2, 0).
In other words,, both lines (both equations) meet or cross each other at the point (7/2, 0).
Understand?
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