### Home > PC > Chapter 7 > Lesson 7.2.1 > Problem 7-36

7-36.

Let *x* = 1st number

Let *y* = 2nd number

Let *P* = the product*x* + *y* = 60*P* = *xy*

1. Solve the first equation for *y* and substitute the result in the second equation.

2. Check where the graph of *P* is a maximum.