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Math Help - i was just wondering if these problems i did were right?

  1. #1
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    i was just wondering if these problems i did were right?

    If A(2, 2), B(5, 5), and C(8, 8), then which is AC - BC?

    4



    Which value of d makes the graph of the equation 3x - dy = 5d perpendicular to the graph of y = 3x - 4?
    d = -9
    d = 9
    d = 6
    d = 3
    Which values of m and n make the midpoint of AB locate at the origin, given A(m, 11) and B(-5, n)?
    m = 5 and n = -11
    m = 11 and n = -5
    m = 10 and n = -22
    m = -10 and n = 22
    Which line is passing through (3, 5) and is parallel to x-axis?
    y = -3x
    y = 3
    y = 5
    y = 3x + 5
    Which point is on the graphs of the lines y = 3x + 2, 2x + 3y = 39, and 2x = 3y - 27?
    (-1, 11)
    (1, -11)
    (3, 11)
    (2, 11)
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  2. #2
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    \begin{array}{l}<br />
 D(A,C) = \sqrt {\left( {2 - 8} \right)^2  + \left( {2 - 8} \right)^2 }  \\ <br />
 D(B,C) = \sqrt {\left( {5 - 8} \right)^2  + \left( {5 - 8} \right)^2 }  \\ <br />
 \end{array}
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  3. #3
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    ac-bc

    That would make it 4 right? Is that the only one I got right? also chose -9, m=5 and n=-11, y=3x+5, and (2,11)
    Last edited by sanee66; June 14th 2007 at 04:18 PM. Reason: I didnt realize the naswers i chose weren't showing!
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