Dependent Independent Variables

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6th Grade

Dependent & Independent Variables

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Table of Contents

Translating to Equations Dependent and Independent Variables Equations and Tables Graphing Equations Glossary

Click on a topic to go to that section.

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Translating to Equations

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Equation

An equation is a statement that shows that two mathematical expressions are equal. These are examples of equations:

12 + a = 15 x / 5 = 10

y = 3x

When writing equations, you want to pull the pieces of important information from the problem, and turn them into mathematical expressions.

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Example

Mrs. Smith bought pencils for her class and spent $5.50 total. If each pencil costs $0.15, how many students are in the class?

This tells us one pencil costs $0.15.

This tells us the equation must equal $5.50.

Do we know how many students are in the class? No, so this will be our variable, so let s = students in the class.

Now, think about how you would calculate the total price of the pencils.

You would multiply the cost of one pencil by the number of students in the class and get the total, so that is how you must set up your equation.

$0.15s = $5.50

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Answer and Math Practice

Try This:

Kristin is three years older than her sister, Sarah. If Kristin is 13 years old, how old is Sarah?

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Answer

1 The Dolphins scored 9 more points than the Jets. The Jets scored 34 points. Which equation could be used to find the number of points p that the Dolphins scored during the game? A p + 9 = 34 B p + 34 = 9 C p 9 = 34 D p 34 = 9

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