Answer:
Each pizza costs for $9.
Explanation:
We are given that Mr. Mori bought four equally-priced pizzas and a $3 bag of potato chips.
Given that he spent a total $39, we are to find the cost of each pizza.
This can be represented by an equation:
![4x+3=39](https://img.qammunity.org/2020/formulas/mathematics/middle-school/v04151cbwpp7cf2rl6r4601el4k109xgkt.png)
Solving it to find x.
![4x=39-3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ffj9njpkj35wgjcns7pxi54xfmavnp2zlb.png)
![4x=36](https://img.qammunity.org/2020/formulas/mathematics/high-school/rq08s1pxnbhk2ngdvtdixugnw0hb1sqzc7.png)
![x=(36)/(4)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/meu9w6whrgrstssmc0exi9dj5cx9vf8quh.png)
x = 9
Therefore, the cost of each pizza is $9.