1.   Determine the value of r so that the line through (r, 4) and (-7, 7) has a slope of .
   
    A. 3 B. -3
    C. 9 D. -11
    Hint

  2.   Determine the slope of the line that passes through (2, 2) and (5, 8).
    A. -2 B.
    C. 2 D.
    Hint

  3.   What is the slope of in parallelogram ABCD?
   
    A. B.
    C. D.
    Hint

  4.   Find the slope of the line that passes through (-2, 9.5) and (4, 5).
    A. undefined B.
    C. 0 D.
    Hint

  5.   Which of the following pairs of coordinates are on a line with an undefined slope?
    A. (-2, -2), (4, 4) B. (2, 1), (5, -2)
    C. (3, -2), (3, 5) D. (-4, -3), (3, -3)
    Hint



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