How do you find the distance between (11, 11), (-13,8)?
11, 11 is 11x +11y and
-13,8 is -13x +8y
If you plot this on a Cartesian x-y graph you will see that there is right angled triangle, formed by the equation
11x +13x and 11y - 8y resulting in a triangle 24x and 3y.
since we are interested in the distance only, we deal only with the absolute values.
distance d is then