7. the function y = 60 - 8x represents the amount y (in dollars) of money you have arter
buying x movie tickets. (a) find the domain of the function. is the domain discrete or continuous
explain. (b) graph the function using its domain.

This function has a couple of restrictions:

With these constraints in mind, we can explicitly write all the possible (x,y) couples:

Where x is the number of tickets bought and y is the amount of money you're left with. So, if you buy no tickets, you still have all your $60. If you buy 1 ticket you're left with $52. If you buy 2 tickets, you're left with $44, and so on.

This table shows that the domain is the set

And the range is the set

And they are both discrete. To graph the function, simply draw all the (x,y) couples on a coordinate grid.