Question 1018949
Lets take an example as say that you wanted to buy  2 snacks and go to the dance. How would you compute how much money that you would spend?

Well, you pay $6 for the dance and 2 times the $1.50 for the two snacks for a total of $9. Now, how do you know if you are actually allowed do that. You compare the $9 that you want to spend to the $12 that you are allowed to spend. Since 9 is less than 12, it must be okay.

Now we just replace that 2 snacks with an S to write our equation. We just need the amount of money we spend on the dance and S snacks to be less than $12