Graphing Functions
Example
Graph the function: f(x) = 2x  4
Solution
Step 1 Make a table of ordered pairs.
Weâ€™ll let x = 6, 3, 0, 3, and 6.
x 
f(x)
= 2x  4 
(x, y) 
6
3
0
3 6 
f(6)
= 26  4
= 2 Â·
6  4 = 12  4 = 8
f(3) = 23
 4
= 2 Â·
3  4 = 6  4 = 2
f(0) = 20
 4
= 2 Â·
0  4 = 0  4 = 4
f(3) = 23
 4
= 2 Â·
3  4 = 6  4 =
2
f(6) = 23
 4
= 2 Â·
6  4 = 12  4 = 8 
(6, 10) (3, 2)
(0, 4)
(3, 2) (6, 8) 
Step 2 Plot the ordered pairs.
Step 3 Connect the plotted points.
Note:
f(x) = 2x  4 is called an absolute value
function.
The graph of an absolute value function
consists of two lines that form a vee, such as
or
