Arthur D. answered • 08/23/17
Tutor
4.9
(306)
Forty Year Educator: Classroom, Summer School, Substitute, Tutor
(1/y)-(1/x)=(x/xy)-(y/xy)=(x-y)/xy
(x-y)/xy
---------- = (x-y)/(xy)÷(x-y)=(x-y)/(xy)*(1/[x-y])=1/xy
(x-y)
