You can put this solution on YOUR website! Formula is:
Square root of(x2 - x1) ^2 + (y2 - y1)^2
Square root of (5/4 -(-5/4)^2 + (-1 -(-7))
Square root of (10/4)^2 +(6)^2
Square root of (5/2)^2 + (6)^2
Square root of 25/4 + 36
Square root of 169/4
= 13/2 = 6.5 units
Hope this helps
:-)