coupon w/$50 off camera purchase of $100 or more at Art's Cameras. Write a function relating camera's purchase price after coupon to the retail price. What is the domain?

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This function indicates a linear model as if the camera's retail is $100, applying the coupon would give the camera a price of $50.  If the camera price retailed at $150, the price of the camera with the coupon would be $100.  Therefore, our variant is the retail price of the camera, so we  will let that be x.

Linear equations are written in the form y = mx+b.  

So y = x (the retail price of the camera) - 50 (the coupon for the camera; where x `>=100`

the function is:  f(x) = x - 50; x `>=100`

x `>=100```

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