NCMom
This a word problem about candy that I have gotten to two equations...
40x +100 y = 125
80x+84y=163
I dont know how to eliminate a variable or solve...thanks
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karatechopper
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Can you tell me what the Word problem was?
NCMom
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ok
NCMom
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40 candy bars and 100 drinks cost $125 and 80 candy bars and 84 drinks cost $163..how much is each candy bar?
CalebBeavers
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Solve for x or y in one of the equations
NCMom
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x= 25 - 5/2 y ?
NCMom
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x= 5/8 y?
CalebBeavers
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40x+100y=125
100y=-40x+125
y=-2/5x+5/4
NCMom
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ok
CalebBeavers
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Now you know what y is so plug that into the other equation and solve for x
80x+84(-2/5x+5/4)=163
NCMom
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Thx.
NCMom
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right..Understand the theory-just seems overly complicated...usually the numbers are all nice and round and even... 84 times negative 2/5x + 5/4 makes my head spin..
CalebBeavers
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Well fractions just multiply straight across top and bottom....think of 84 as 84/1
NCMom
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Thanks Caleb.
CalebBeavers
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What do you get for your answer?
NCMom
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I dont...gonna let him finish the math and thanks for your help.
NCMom
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75 cents and 1.25!!