Curved line trouble again.?

Question

In the equation:

(x-xa)

---------

(xb-xa)

What what do (a) and (b) correspond to?

I know (x) and (y) are the up-down,left-right coordinates, but what about (a) and (b)?

Answer 1

They are just any constant number except 0 as it will make denominator 0. You just treat them as numbers.  

eg. ax = 1 here a is a constant number.

To solve it we put x = 1/a. It works for any value of a except 0.

If we take a = 2 then the answer is 1/2, if 3 then answer is 1/3 and so on.

In mathematical language they are called constants.

Answer 2

factor the x from top and bottom cancel and state x not = 0 what remains appears to be a horizantal line for the graph passing through (x,(1-a)/(b-a))