Chapter 8.3, Problem 10IP

To determine

Translate into an equation

Answer to Problem 10IP

The equation is $x+21=85$

Explanation of Solution

Given:

Eileen drove for 85 minutes. This is 21 more minutes than one-third the number of minutes Ethan drove

Concept Used:

Rules of Addition/ Subtraction:

• Two numbers with similar sign always get added and the resulting number will carry the similar sign.
• Two numbers with opposite signs always get subtracted and the resulting number will carry the sign of larger number.

Rules of Multiplication/ Division:

• The product/quotient of two similar sign numbers is always positive.
• The product/quotient of two numbers with opposite signs is always negative.

In order to translate the sentence into an equation

Let x be the number of minutes Ethan drove

Since Eileen drove for 85 minutes. This is 21 more than one third of x as shown below,

  $x+21=85$

Thus, the equation is $x+21=85$