Unit 7 Quiz 1 Review Answer Key

1a) This graph is not a function as it does not pass the vertical line test, since there will be more than one point on a vertical line.  There is more than one y-coordinate paired with each x-coordinate.

1b) This graph is a function because it passes the vertical line test.  There will only be one point on each vertical line that is drawn.

2a) The relation is a function since each x-coordinate is paired with one and only one y-coordinate.

2b) This function is a linear function since it has a constant first difference in the y-values.

3) y = -3

4) m = 4/3

5) Quadrants II & III

6) x-intercept -- ( 16 ,0)   & y-intercept -- (0, -18)

7) y2 - y1  =   4 - 8     =  -4  = -1
    x2-x1         3 - (-5)       8       2

8) y = -0.5x +4

9) y = 12  & x = -8

10) 3x - 2y = -6    -- Standard Form
      y = 3/2x +3  -- Slope - intercept form
 m = 3/2  (up 3, right 2)
 b = 3