Question 245977
solve by the elimination method
0.3x-0.2y=4
0.2x+0.5y=-21/23
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Multiply thru each equation by 1000 to get:
300x - 200y = 4000
200x + 500y = -913
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Let's say you want to eliminate the x-terms:
Multiply thru the 1st equation by 2
Multiply thru the 2nd equation by 3
600x - 400y = 8000
600x +1500y = -2739
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Subtract the 1st from the 2nd to get:
1900y = -10,739
y = -5.65
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Substitute into 300x - 200y = 4000 to solve for "x":
300x - 200*-5.65 = 4000
300x = 2870
x = 9.57
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These problems are so messy because they assume you
are using a calculator to do the arithmetic.
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Cheers,
Stan H.