Question 979387: How many solutions does the system 3x-y=-6 & 3x+y=6 have?
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! Add up the equations to get
3x-y=-6
3x+y=6
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6x+0y = 0
That leads to 6x = 0 which means x = 0. You then use x = 0 to find y. Plug it into any equation with x & y in it. You'll find that y = 6.
So there is exactly one solution and it is the ordered pair (0,6)
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