The coordinates of D and E are 2 and 4.
DE = (Distance formula)
= or 2 (Subtract: )
The measure of DE line is or 2.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"graph](\"http://www.mathskey.com/userfiles/image/Library/Geometry/graph_coordinates_A_B_minus4_minu1%281%29.gif\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=69775d4f6a399e00a482d17e547c759d.png\")
(Distance formula)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=cd26b212b9a032bd60be40f9a55c5002.png\")
or 2 (Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3d1432223fbeb0d5121d62f163597fd8.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=cd26b212b9a032bd60be40f9a55c5002.png\")
or 2.