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Thread: perpendicular lines SAT math

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  1. #1

    perpendicular lines SAT math

    Which of the following is the equation of the line that is perpendicular to line and passes through the point ?

    (A)

    (B)

    (C)

    (D)

    (E)

    Thanks!

  2. #2
    Junior Member
    Join Date
    Jun 2013
    Posts
    26
    First we must find the slope of the line . Thus, we must rewrite the equation to slope-intercept form i.e. where is the slope.

    So, the equation can be written as .

    The slope of a line which is perpendicular to the previous line is equal to .

    Thus, the required equation will be in the form of


    Due to the fact the this line passes through the point , we have to plug in the coordinates of this point to the equation and obtaining with this way the value of ,


    Finally the equation will be given by the formula


    Therefore the correct answer is (D).

  3. #3
    Thanks Brynlee!!

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