Digits, Grade 7, Volume 1, Homework Helper

2-2: Writing Two-Step Equations

Part 1

Example Writing One-Step Equations

The length of an average toucan is about two thirds the length of an average blue-and-yellow macaw. Toucans are about 24 in. long. Write an equation to represent this situation.

Solution

Words to equation.

The equation 24 equals , 2 thirds , middle dot script l represents this situation.

Part 2

Intro

A two-step equation is an equation that has two operations. Many real-world problems need more than one operation to describe the situation. Consider the photographer's situation.

A photography student wants to buy a digital camera that costs $269.95. She plans to make a down payment of $100 and pay the remainder in five equal monthly payments. Write an equation to represent this situation.

Given information:

  • • The cost of the camera: $269.95

  • • The amount of the down payment: $100

  • • The number of monthly payments: five


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Table of Contents

Digits, Grade 7, Volume 1, Homework Helper Unit A: Number and Operations Unit B: Expressions, Equations, and Relationships Unit C: Measurement and Geometry Unit D: Proportionality English/Spanish Glossary Formulas Math Symbols Formulas Measures Properties