Subtract the y coordinates in any order
(-4 - 9) = (-13)
Square this (-13)^2 = 169 (1)
Subtract the x coordinates in any order
( 6 - 3) = (3)
Square this (3)^2 = 9 (2)
Add (1) and (2) = 169 + 9 = 178
Take the square root of this
sqrt (178) = 13.34 = the distance
