### Home > CAAC > Chapter 10 > Lesson 10.1.2 > Problem 10-23

10-23.

Define the variables. *x* = number of minutes*y* = temperature of the metal

Create a system of equations to find the two unknowns.

*y* = 2*x* + 20

*y* = −3*x* + 240

*x* = 44 minutes

10-23.

Define the variables. *x* = number of minutes*y* = temperature of the metal

Create a system of equations to find the two unknowns.

*y* = 2*x* + 20

*y* = −3*x* + 240

*x* = 44 minutes