miss

square root of (x2 - x1)squared + (y2-y1)squared 

square root of (x2 - x1)squared + (y2-y1)squared 

((x1+x2/2),(y1+y2/2))

y=f(x)..........y=f(x)+A

y=f(x)........ y=f(x+a)

                       (x-a)

remeber if its plus a then it moves a many to the left and if its minus a then it moves a many to the right