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    kidlow's Avatar
    kidlow Posts: 1, Reputation: 1
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    #1

    Sep 19, 2007, 08:26 PM
    algebra using two points
    I need help on this problem it goes...

    write an equation of the line that passes through (6,-10) and is perpendicular to the line that passes (4,-6) and (3,-4).

    need step by step help please thanks.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Sep 19, 2007, 08:55 PM
    Your taxing my memory. You can find the eqn of a line passing through (4,-6) and (3,-4) using the 2 point form and find the slope.

    A perpendicular line #1 to another line #2 has the ____ _____ of the slope of line #1. You can figure it out graphically. Hint: draw any line with a slope of 1/2. Then draw a perpendicular line. What's it's slope. What's the relationship?

    Now you can use the 1st point and the massaged value of the slope to find the eqn.
    s_cianci's Avatar
    s_cianci Posts: 5,472, Reputation: 760
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    #3

    Sep 22, 2007, 04:51 PM
    You need to consider, in this order:

    1. What is the slope of the line through (4 , -6) and (3 , - 4)?
    2. What is the slope of any line perpendicular to that line?
    3. Use your obtained slope from #2 and the given point (6 , -10) to write your equation.
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