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Math Help - Writing an equation of a line in standard form

  1. #1
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    Writing an equation of a line in standard form

    Recall how to write an equation of a line in standard form given 2 points
    • no fractions
    • no decimals
    • x is positive
    **********
    1) (1/2,-2); (1/2,5)

    2) (3,-6); (10,-6)
    i planned to use m=y2-y1/x2-x1, then y=mx+b, and then put it into Ax+By=C. but after using m=y2-y1/x2-x1, i kept getting a fraction: 7/0 for #1 and 0/7 for #2. i can't remember which one is indefinite, but i'm stuck on the first step because the teacher said no fractions... thanks in advance
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  2. #2
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    Line #1 is simply: 2x=1.
    Some textbooks insist that standard form is: Ax+By+C=0,\;A>0.
    Be sure to see what your text says.
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  3. #3
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    Quote Originally Posted by Plato View Post
    Line #1 is simply: 2x=1.
    Some textbooks insist that standard form is: Ax+By+C=0,\;A>0.
    Be sure to see what your text says.
    2x=1? the thing is that the publisher hasn't sent our textbooks yet, we are working blindly w/problems she throws at us. she hasn't explained it either because it's, "review." may i ask the steps you would use or how you got 2x=1?
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    Quote Originally Posted by trancefanatic View Post
    2x=1? the thing is that the publisher hasn't sent our textbooks yet, we are working blindly w/problems she throws at us. she hasn't explained it either because it's, "review." may i ask the steps you would use or how you got 2x=1?
    Bless you my friend, you are the casualty of fraud.
    If you want to take legal action, I will take you side.
    The whole “online teaching of mathematic is a scam”!
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  5. #5
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    Quote Originally Posted by Plato View Post
    Bless you my friend, you are the casualty of fraud.
    If you want to take legal action, I will take you side.
    The whole “online teaching of mathematic is a scam”!
    ..............wait, what???!
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  6. #6
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    Quote Originally Posted by trancefanatic View Post
    ..............wait, what???!
    Here is 47 years of teaching experience speaking.
    If you or the institution offering an online course in mathematics thinks that such a course will teach you the equivalent of an on campus course, then I have a big bridge in NY to sell you both for $1.

    Any online course in mathematics is a joke!
    It cannot be done. You can pay your money. You can even get a passing grade. But you will not understand the material that is in 70% of the cases a prerequisite to the rest of your life. WHY TAKE THE CHANCE
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  7. #7
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    Well, this might make you laugh. It's not an online course! The institution just opened a few weeks ago and haven't received text books yet. Why? I don't know, but all I know is that this teacher makes no sense to me whatsoever because of her extreme methods that are "outside of the box." Although these problems are due tomorrow... I think it'd be a risk I'd have to take (F).

    Oh well.
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  8. #8
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    Quote Originally Posted by trancefanatic View Post
    Recall how to write an equation of a line in standard form given 2 points
    • no fractions
    • no decimals
    • x is positive
    **********
    1) (1/2,-2); (1/2,5)

    2) (3,-6); (10,-6)
    i planned to use m=y2-y1/x2-x1, then y=mx+b, and then put it into Ax+By=C. but after using m=y2-y1/x2-x1, i kept getting a fraction: 7/0 for #1 and 0/7 for #2. i can't remember which one is indefinite, but i'm stuck on the first step because the teacher said no fractions... thanks in advance
    1) Note that any points on a line passing though these points is going to have the same x value. Thus x = \frac{1}{2}. Now put that in standard form without any fractions.

    2) Note that any points on a line passing through these points is going to have the same y value. etc.

    -Dan
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