Question 246077
0.3x-0.2y=4
0.4x+0.5y=-55/17
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Multiply thru the 2nd equation by 17 to get rid of the denominator:
6.8x + 8.5y = -55
0.3x-0.2y=4
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Multiply thru both equations by 10 to get rid of the decimals:
68x + 85y = -550
3x - 2y = 40
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Let's say you want to get rid of the y-terms:
Multiply thru the 1st equation by 2 and
Multiply thru the 2nd equation by 85.
136x + 170y = -1100
255x - 170y = 3400
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Add the two equations and solve for "x":
391x = 2300
x = 2300/391
x = 100/17
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Substitute into 3x-2y=40 to solve for "y":
3(100/17)-2y = 40
300 - 34y = 680
34y = -380
y = -190/17
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Cheers,
Stan H.