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Math Help - equation of the line that passes through the point

  1. #1
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    Post equation of the line that passes through the point

    which one of the following is the equation of the line that passes through the point (-5,7) and is parallel to the y-axis?

    1. y = -5
    2. y = 7
    3. x = -5
    4. x = 7
    5. y = 5/7
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  2. #2
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    Quote Originally Posted by Alexander View Post
    which one of the following is the equation of the line that passes through the point (-5,7) and is parallel to the y-axis?

    1. y = -5
    2. y = 7
    3. x = -5
    4. x = 7
    5. y = 5/7
    Any line which is parallel to y-axis must have the equation x=k for some number k.

    Since it must pass through (-5,7) we see that k=-5 (the x-coordinate).
    Last edited by ThePerfectHacker; June 6th 2007 at 08:49 AM.
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