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Math Help - equations of lines

  1. #1
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    equations of lines

    Write the slope of a line that is parellel to each line
    y=2x - 5
    3x+y = 10

    Write an Equation for the line containing the point (6,-2)
    Parrell to the line 2x + y = 5
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by Haxcake View Post
    Write the slope of a line that is parellel to each line
    y=2x - 5
    3x+y = 10

    Write an Equation for the line containing the point (6,-2)
    Parrell to the line 2x + y = 5
    If you rearrange a linear equation into standard form:

    y=mx+c,

    then m is the slope, and all lines parallelto your line have this same slope.

    You first line is already in standarf form, so the slope of lines parallel to it
    is 2.

    The secod equation: 3x+y=10 can be rewritten:

    y=-3x +10,

    so the required slope is -3.

    The third equation can be rewritten: y=-2x+5, so the slope of the required
    line is -2, so the line is of the form:

    y=-2x+c

    If this goes through (6, -2), we have:

    -2 = -2*6 + c,

    so:

    c=-2 + 2*6 = 10,

    and then the equation of the required line is:

    y = -2x+10

    RonL
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