SOLUTION: solve by the elimation method. 0.3x-0.2y=4 0.4x+5y=1 What is the solution set I came up with (220/23, - 130/23) am I right or close to it

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Question 233220: solve by the elimation method. 0.3x-0.2y=4
0.4x+5y=1 What is the solution set I came up with (220/23, - 130/23) am I right or close to it

Found 2 solutions by Edwin McCravy, stanbon:
Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!

If you meant this system:



then you are right.  But that's not the system you posted.

You posted this system instead:

 

and the correct solution to it is (1010/79, -65/79)

Edwin

Answer by stanbon(75887)   (Show Source): You can put this solution on YOUR website!
solve by the elimation method. 0.3x-0.2y=4
0.4x+5y=1 What is the solution set I came up with (220/23, - 130/23) am I right or close to it
-------------------
Multiply thru both equations by 10 to get:
3x-2y=40
4x+50y=10
--------------------
Multiply thru the 1st equation by 25:
75x-50y=1000
4x +50y = 10
-----------------------
Add and solve for "x":
79x = 1010
x = 1010/79
----
Then substitute into 3x-2y=50 to solve for "y".
===================================================
Cheers,
Stan H.

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