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

Algebra ->  Equations -> 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      Log On


   

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) About Me  (Show Source):
You can put this solution on YOUR website!

If you meant this system:

system%280.3x-0.2y=4%2C+0.4x%2Bred%280.5y%29=1%29

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

You posted this system instead:

system%280.3x-0.2y=4%2C+0.4x%2Bred%285y%29=1%29 

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

Edwin

Answer by stanbon(75887) About Me  (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
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Multiply thru both equations by 10 to get:
3x-2y=40
4x+50y=10
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Multiply thru the 1st equation by 25:
75x-50y=1000
4x +50y = 10
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Add and solve for "x":
79x = 1010
x = 1010/79
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Then substitute into 3x-2y=50 to solve for "y".
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Cheers,
Stan H.