Math
posted by Laura on .
What is the inverse equation of f(x)=(x+2)/(x1)?

let y = (x+2)/(x1)
first step in finding the inverse is to interchange the x and y variables, so
inverse is
x = (y+2)/(y1)
now solve this for y
xyx = y+2
xy  y = 2+x
y(x1) = 2+x
y = (x+2)/(x1)
test with some x and y
in original , let x = 2
then y = 4/1 = 4
in new equation , let x = 4, should get y = 2
y = (4+2)/(41) = 6/3 = 2
yeah!!!!