Question

Can someone please help me with number 13.

Answer 1

You can set up 2 equations for the two companies that sell pizza. Pizza A's will be:
$y = 1.5x+10$

And B's will be:
$y = x+12.50$

To find the number of toppings we will need to make the companies prices equal can be found by setting the equations equal to each other and solving for x, because x is the price per topping. So:
$1.5x+10 = x+12.50$
$1.5x = x+2.50$
$0.5x = 2.50$
$x = \frac{2.5}{0.5} = 5$

So, the number of toppings you will need is 5 toppings to make their prices equal. 

*If any step is unclear, then hmu!