Question 15666
find the inverse of Y=4x and y=x-2
  in these equations called functions , x is considered independent variable and y as dependent variable. generally you find Y on the l.h.s.  expressed explicitly as equal to some function of x ....as 4x in the above example 
 to find inverse means we have to express x as function of y 
hence we have y = 4x 
  x = y/4 ...is the inverse
  for the second example y = x - 2 
 x = y+2 ...is the inverse