Thank you for the opportunity to help you with your question!
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
y : purchasing 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
Please let me know if you need any clarification. I'm always happy to answer your questions.