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Math Help - My teacher says this linear equation is wrong, I think she is wrong.

  1. #1
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    My teacher says this linear equation is wrong, I think she is wrong.

    4. (-7) = (-2)(-2) + b


    (-7) = (4) + b

    -11 = b

    y = -2x -11

    I don't see anything wrong with this Do you?
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  2. #2
    Super Member Matt Westwood's Avatar
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    Looks okay to me. What does she think it ought to be? Maybe it's the bit that leads up to this what's wrong.
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  3. #3
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    Quote Originally Posted by bobbyboy1111 View Post
    4. (-7) = (-2)(-2) + b


    (-7) = (4) + b

    -11 = b

    y = -2x -11

    I don't see anything wrong with this Do you?
    What was the question? The only thing "wrong" with that is that it doesn' maqke any sense at all! Why should "b" have anything at all to do with x and y? What are you trying to do?

    Frankly, it looks to me like you have a very good teacher who is concerned about your tendency to do algebraic operations without thinking about what you are doing.
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  4. #4
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    Quote Originally Posted by HallsofIvy View Post
    What was the question? The only thing "wrong" with that is that it doesn' maqke any sense at all! Why should "b" have anything at all to do with x and y? What are you trying to do?



    Frankly, it looks to me like you have a very good teacher who is concerned about your tendency to do algebraic operations without thinking about what you are doing.
    It does because it is a linear equation and it turns out I was right, relating what I said.


    NO.
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  5. #5
    Senior Member Stroodle's Avatar
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    Quote Originally Posted by bobbyboy1111 View Post
    It does because it is a linear equation and it turns out I was right, relating what I said.


    NO.
    No it doesn't...
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  6. #6
    Senior Member pacman's Avatar
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    The problem may be have this given values, slope = m = -2; then the line passes through points (-2,-7). find the equation of the line.
    y = mx + b, where m = -2 and points (-2,-7), substituting
    (-7) = (-2)(-2) + b
    (-7) = (4) + b
    -11 = b
    y = -2x -11. This is the slope-intercept form and seems alright.

    What if you have interchanged the point (-7,-2) to (-2,-7)?

    Or you have the wrong form of the equation of the line . . . .
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  7. #7
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    This thread has required constant moderation from the go get. It has become too troublesome to keep opened.

    Thread closed.
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