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Math Help - help with fraction

  1. #1
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    Exclamation help with fraction

    I need to know all the stuff included in "solving equations by multiplying or dividing by decimals", i have a pretty good idea, but not good enough and no other site has been helpful. Please help!!! quickly too, please.
    bad at math.
    Last edited by +-*/=; May 22nd 2007 at 07:04 PM. Reason: forgot to add somehing
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by +-*/= View Post
    not so easy... i ahve to make my own examples and stuff. Just... Well, i know i need to include inverse operations, that kind of stuff... example:

    3.4x=5.6

    still too vague? i don't really know how to describe it too well...\

    just need the steps to solving really. x being a variable not a *symbol
    ok, when we say "solve (an equation) for x" it means we want you to get x by itself on one side of the equation, that is, you should end up with "x = something"

    now when we have a coefficient of x (that's the number in front of x) all we do (whether we have decimals or whole numbers) is divided both sides of the equation by the coefficient of x. that way, the coefficient of x will cancel with the number we divided by (since any number divided by itself is 1) and we would end up with 1x = soemthing, but 1x is just x. so here we go:

    3.4x = 5.6

    \Rightarrow \frac {3.4x}{3.4} = \frac {5.6}{3.4}

    \Rightarrow \frac {1x}{1} = \frac {5.6}{3.4} ....it is not necessary to write this step, i just wanted to show you how the numbers cancel. now we have 1x/1, which is just x, on one side, just what we wanted, now just calculate the other side

    \Rightarrow x = 1.647 to three decimal places
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  3. #3
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    Thumbs up still...

    the teacher gave us all different subjects to "teach" to te class, bu someone already ad what you described, she put it with decimals as something else. So how would you tie in decimal solving? thanks anyway though, helpful still.
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by +-*/= View Post
    the teacher gave us all different subjects to "teach" to te class, bu someone already ad what you described, she put it with decimals as something else. So how would you tie in decimal solving? thanks anyway though, helpful still.
    if someone else already did it, why are you doing it. what way did the girl do it? there is not much room for creativity here i'm afraid, there are only so many ways you could solve something like this. tell me what specifically you are looking for (or what you are specifically NOT looking for)
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  5. #5
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    Exclamation .

    well, it was done before, but with normal whole numbers, i have decimals! Ad there must be some way to tie in decimals or i wouldn't have gotten this subject.
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by +-*/= View Post
    well, it was done before, but with normal whole numbers, i have decimals! Ad there must be some way to tie in decimals or i wouldn't have gotten this subject.
    you could multiply by some multiple of 10 to turn it into a whole number equation.

    3.4x = 5.6 .......now multiply both sides by ten

    \Rightarrow 10(3.4x) = 10(5.6)

    34x = 56 .....now this is an equation with whole numbers

    \Rightarrow \frac {34x}{34} = \frac {56}{36}

    \Rightarrow x = 1.647
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  7. #7
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    ...

    Thanks. It's two people per day that present, and my friend is going tomorrow too. Hopefully he goes first so I can laugh at him before people laugh at me. I won't be the first person to do badly, and I won't do the worst either.
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