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exoticanb4u
- Newbie | Next Rank: 10 Posts
- Posts: 6
- Joined: Tue Aug 18, 2009 8:52 pm
If x + |x| + y = 7 and x + |y| - y =6 , then x + y =
x+|x|+y=7
x+|y|-y=6
|x|=7-y-x
x could equal 7-y-x or -(7-y-x)
x=7-y-x-->x=(7-y)/2
x=-7+y+x--> 0=-7+y. This really isn't useful at all.
Substitute the x=(7-y)/2 into the second equation to obtain y=-1 or y=7.
From this we get x=4 or x=0.
x+y=4-1=3 or 0+7=7.
