The coordinates of C and F are 0 and 7.
CF = (Distance formula)
= or 7 (Additive identity property: )
The measure of CF line is or 7.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"graph](\"/userfiles/image/Library/Geometry/graph_coordinates_A_B_minus4_minu1(1).gif\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9e4611e424349dd40a0263e7cf7d846a.png\")
(Distance formula)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=51693843511954aa88ac73435e6a7791.png\")
or 7 (Additive identity property: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1407f4c1ea2e985d8eb7c0e30953def0.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
or 7.