Question 84959
What you have, when graphed, is a right triangle with a distance of (5-0)=5 on the x axis & (2+4)=6 on the y axis. 
Using the pythagorean theorum we get:
5^2+6^2=c^2
25+36=c^2
61=c^2
c=sqrt61
c=7.81 is the distance between these 2 points.