I am assuming the problem is asking you to find an equation repersenting the situation.
In this case, realize that 150 will be a constant, and 60 will be attached to the
variable, since the price of the textbooks changes based on how many textbooks there are.
Thus, the equation is:
![60x + 150 = y](https://img.qammunity.org/2019/formulas/mathematics/college/tdzp5z0tu6cthzuyiorwmozxj65mcsuzwn.png)
Our answer is 60x + 150 = y.