Algebra (Word Problem)

Here's the word problem:

You have a coupon for $50 off your camera purchase of $100 or more at Camera World.

Write a function relating a camera's purchase price after coupon, y, to the retail price, x.
Give the domain of this function.

Here is what I have so far:

y = price after coupon x = original price

x - y >= 100 NOTE: >= is "greater than or equal to".

I don't think I wrote the function correctly. Also, I can't seem to remember what the "domain of a function" is.

Any help you could provide is very much appreciated.

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asked by Beth
  1. y = x - 50
    domain x>100

    domain is the part of the x axis where the function is valid

    for example the function
    y = 1/x
    domain is 0< x <0
    but does not include x = 0
    where it is undefined

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    posted by Damon

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