Absolute Value
Press 
and scoll down to option B to view the num menu, then choose option1
to select abs.
The absolute value function finds the absolute value of the argument
immediately following. Don't foget the rght parentheses.
To find the value of |-4.2357|, enter
abs( 
4.2357)
To enter an absolute value function, enclose the argument in the shown vertical lines.
For y = |x - 11| + 7, press 
then enter
abs
11
Then use 
to esape from the absolute value symbols and enter
7
