Posted: 1/24/2013 1:55:45 PM EDT
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I have a basic algebra problem as part of my physics online homework as a review and I nor my gf can not figure out it. Either that or the online program is not taking our answers. I have not done algebra since 06 so help is greatly appreciated.
Must solve for x and y x + y= 9.0 0.50 x+ 0.20y = 3.45 If you answer it would you mind please posting the steps? I know you have to solve for one in the first step leaving x = 9.0 - y Its the 2nd half I am not sure about. Thanks in advance, Payton |
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fuck it, im too tired to do math, forget everything I said
EDIT: Ok here we go, ill try not to fuck it up this time: x+y = 9 x+y-y = 9-y x = 9-y .5(9-y) + .2y = 3.45 4.5 - .5y + .2y = 3.45 4.5 - .5y + .2y - 4.5 = 3.45 - 4.5 -.3y = -1.05 -.3y / -.3 = -1.05/-.03 = y = 3.5 Wow, took me long enough eh? Someone should revoke my degree. |
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Quoted: I have a basic algebra problem as part of my physics online homework as a review and I nor my gf can not figure out it. Either that or the online program is not taking our answers. I have not done algebra since 06 so help is greatly appreciated. Must solve for x and y x + y= 9.0 0.50 x+ 0.20y = 3.45 If you answer it would you mind please posting the steps? I know you have to solve for one in the first step leaving x = 9.0 - y Its the 2nd half I am not sure about. Thanks in advance, Payton 0.20y = 2.95 y = 2.95/.2 = 14.75 x = 9 - 14.75 = -5.75 ETA: I missed the 'x' in the 0.50x, which makes the above useless. See the post above mine |
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x+y = 9
0.5x + 0.2y = 3.45 x = 9-y 0.5(9-y) + 0.2y = 3.45 4.5 - 0.5y + 0.2y = 3.45 1.05 = 0.3y y = 3.5 x=9-y x = 9-3.5 x = 5.5 Now check your work by substituting your values for x and y into both original equations: x + y = 9 5.5 + 3.5 = 9 OK 0.5x + 0.2y = 3.45 0.5 (5.5) + 0.2 (3.5) = 3.45 2.75 + 0.7 = 3.45 OK |
I have to do all sort of multivariable calculus for my physics