I would think the best deal is 5 pizzas for $19.00
A. Make a list of the first 10 integers that come to your head should NOT be used
There are 3. They're 16,25 and 36
Y = mx + b. Use this equation for most linear functions. Enter the information that is given to you.

Multiply the -3 and 4 to get 12.

Now divide the -12 from both sides.

-12 cancels out on the right side and your left with

Now re-enter the info back into the formula.

Then you've got your formula