##### Write an inequality function.

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An online retailer currently offers a %40 discount on cameras.Write a function relating a camera's purchase price, y, to the retail price, x. Give the domain of this function. Graph the function.

Nov 18th, 2015

A 40% discount means that the buyer will pay 60% of the price meaning     x >  y > 0.6 x

I also put x in the upper limit because if i dont then there a change that the purchasing price will be higher than the original price .

By the way x : original price

At first i thought the domain would be all numbers , x belogns (-oo,+oo) but then i figured that negative x means negative price for the camera which in turn means that the seller will pay money to the buyer to buy the camera which doesnt make any sense . So we need to exclude negative numbers from the domain of the function and zero (that would mean that the seller sold the camera for free) . Thus the domain will be x belongs to (0,+oo)

P.S i dont understant why the problem  ll ask you to use an inequality function  but anyhow here is the graph of that function .( i think you just need the line y = 0.6x thow for this problem)

where x axis is ofcourse the original price and y is the purchasing price  . Because you have an inequality that means that the purchasing price will be in the red part not just the line y = 0.6 x

Nov 18th, 2015

Thanks so much for your quick answer. So for the domain, could I say it as x>0 because I haven't learned what (0,+oo) means yet.

Nov 18th, 2015

Thanks so much, I understand now, I feel like the answer was just staring me in the face and I couldn't see it.

Nov 18th, 2015

oh when I posted the comments it took me to an error site. I didn't know they got posted lol

Nov 18th, 2015

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Nov 18th, 2015
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Nov 18th, 2015
Dec 6th, 2016
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