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Math Help - Algebra 1

  1. #1
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    Algebra 1

    Hello all, thank you for your time.
    First I would like to apologize. I have asked this question before on a reply to one of my earlier threads, but, since that thread already has 3 replies, no one is reading it, thinking my first question has already been answered. I am in a slight hurry so I will ask it again. Again, sorry to all you moderators who I know do not like double-posting. I hope you understand I'm in a time-crunch.

    Write the equation of the line that is parallel to line A and passes through Point P

    Line A=



    Point P= (-1,2)

    That would be:
    right?
    Originally it would be +b (y=mx+b) but since it's -x the + changes to a - correct?
    If so, it would be

    Add 2

    -4=b

    and the answer would be


    correct?
    I am asking this because I have been incorrect on some -x problems I have done before. I just wanted to make sure that since it's -x, and since the equation would originally be addition, but since it's -x, it is changed to subtraction.

    If i am incorrect, and you still add b instead of subtracting it, the answer is positive 1 i believe.
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  2. #2
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    Write the equation of the line that is parallel to line A and passes through Point P

    Line A=



    Point P= (-1,2)



    your solution, y = 2x - 4 is incorrect ... the slope of your solution is 2, the slope of line A is -1 ... parallel lines have the same slope.

    the line parallel to line A has slope m = -1 and passes through the point (-1,2).

    link to using the point-slope form ... equations lines point slope
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  3. #3
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    Sorry I typed that incorrectly:

    The answer would be

    y=-x-4
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  4. #4
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    Wait, I don't think I'm even correct there,

    if the line is y=-x+4

    and the point is (-1,2)

    then the equation would be

    2=1+b
    Subtract 1
    1=b

    y=-x+1
    is, I believe, the correct answer
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