Unit D: Graphing

Practice


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  1. Use the table of values to answer the following.

    2. x y
    0 0
    2 15
    4 30
    6 45
    8 60


    1. Determine if the set of data represents direct variation.

    2. Draw the graph

    3. Calculate the slope.

Use the table of values to answer the following.

x y
0 0
2 15
4 30
6 45
8 60

  1. Determine if the set of data represents direct variation.

  2. Draw the graph

  3. Calculate the slope.








  1. When the x-value increases by 2, the y-value increases by 15. The data also includes the origin, (0, 0). Therefore, the table of values represents direct variation.




  3. Any two points can be used to calculate the slope. However, using the point (0, 0) will make the calculation easier.

    Let (0, 0) = (x1, y1) and (2, 15) = (x2, y2).

    m = y 2 - y 1 x 2 - x 1 = 15 - 0 2 - 0 = 15 2 = 7 . 5

    The slope is 7.5.