If $4.50 will buy 3 bus tickets, how many bus tickets can be bought with $18?

12 Bus Tickets

Step-by-step explanation:

18 / 4.50 = 4 x 3 Bus tickets = 12 Tickets

Step-by-step explanation:

the 2nd line can be rewritten as y < x-3

So, any value that is less than both 4x+4 and x-3 will work

Pick any value you want for x, and figure y possibilities

x=0; x-3=-3, 4x+4=4, so y<-3 ... (0,-5) will work

I'm sure you can now come up with other pairs.