SOLUTION: Please help me solve this equation by using substitution. Here is the problem... 1.2x-y=-3 x+y=9 Below is the work that I did to attempt the problem, but i know its not c

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: Please help me solve this equation by using substitution. Here is the problem... 1.2x-y=-3 x+y=9 Below is the work that I did to attempt the problem, but i know its not c      Log On


   

Question 699724: Please help me solve this equation by using substitution. Here is the problem...
1.2x-y=-3
x+y=9
Below is the work that I did to attempt the problem, but i know its not correct.
x+y=9
x=9
(9)2x=18
x=18
18-y=-3
-18
y=-21
18-21=-3
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
1.2x-y=-3
x+y=9
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Add the left sides; Add the right sides.
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2.2x = 6
Solve for "x":
x = 2.73
-------
Solve for "y":
x + y = 9
2.73 + y = 9
y = 6.27
---------
Answer: (2.73,6.27)
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Cheers,
Stan H.
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