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adamocantus
adamocantus asked in Science & MathematicsMathematics · 9 years ago

Linear equations in two variable?

I'm working on studying for a placement test. One of the questions on the practice packet is:

Point A (-4, 1) is in the standard (x,y) coordinate plane. What must be the coordinates of point B so that the line x=2 is the perpendicular bisector of AB?

I don't even understand the question. Its category is listed as a linear equation in two variables, honestly I don't know what that means either.

Help? :(

1 Answer

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  • nyc_kid
    Lv 7
    9 years ago
    Favourite answer

    The answer is B = (8,1)

    Start with B = (a,b)

    The line x = 2 is the vertical line passing through x=2 .

    This means that (a+ (-4))/2 = 2 ==> a=8

    And in order to be perpendicular to a=2, b = 1.

    So, the answer is B = (8,1)

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