### Home > CCA2 > Chapter 3 > Lesson 3.2.1 > Problem 3-64

3-64.

A piece of metal at

Define variables.

Let ; let

*of the metal in*

Write equations for each metal.

Since the temperatures are changing at constant rates the equations are linear.

Temperature of first piece of metal:

Temperature of second piece of metal:

Use substitution to solve the system.