SOLUTION: Can anyone help me solve each system by addition. x+y=7 x-y=9 ------ x-2y=-1 -x+5y=4 ------- 3x+5y=-11 x-2y=11 -------- 2x=2-y 3x+y=-1 Thanks for your help

Question 186841: Can anyone help me solve each system by addition.
x+y=7
x-y=9
------
x-2y=-1
-x+5y=4
-------
3x+5y=-11
x-2y=11
--------
2x=2-y
3x+y=-1
Thanks for your help

Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
x+y=7
x-y=9
------
2x=16
x=16/2
x=8 ans.
8+y=7
y=7-8
y=-1 ans.
*****************************
x-2y=-1
-x+5y=4
-------
3y=3
y=3/3
y=1 ans.
x-2*3=-1
x-6=-1
x=-1+6
x=6 ans.
***********************************
3x+5y=-11
x-2y=11 multiply by -3 & add.
3x+5y=-11
-3x+6y=-33
----------
11y=-44
y=-44/11
y=-4 ans.
3x+5*-4=-11
3x-20=-11
3x=-11+20
3x=9
x=9/3
x=3 ans.
**********************************
2x=2-y or 2x+y=2 now multiply by -1 & add.
3x+y=-1
-2x-y=-2
---------
x=-3 ans.
2*-3=2-y
-6=2-y
-6-2=-y
-8=-y
8=y ans.

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