SOLUTION: system of equations/elimination method 0.3x - 0.2y = 4 0.2x + 0.5y = 1

Algebra ->  Systems-of-equations -> SOLUTION: system of equations/elimination method 0.3x - 0.2y = 4 0.2x + 0.5y = 1      Log On


   

Question 229575: system of equations/elimination method
0.3x - 0.2y = 4
0.2x + 0.5y = 1
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
system of equations/elimination method
0.3x - 0.2y = 4
0.2x + 0.5y = 1
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Get rid of the decimals:
3x - 2y = 40
2x + 5y = 10
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Multiply 1st Eq. by 2 and 2nd equation by 3 to get:
6x - 4y = 80
6x + 15y = 30
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Subtract 1st from 2nd to get:
19y = -50
y = -50/19
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Substitute into 2x+5y=10 to solve for "x":
2x + 5(-50/19) = 10
2x - 250/19 = 190/19
2x = 440/19
x = -220/19
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Cheers,
Stan H.