# Independent and Dependent Variables

## Overview

An **independent** **variable** is an unknown number.

A **dependent** **variable** is an unknown number that changes depending on the independent variable.

For example…

Sarah always eats **3** times as many cookies as Joey. Write an expression to represent

the relationship between the number of cookies Sarah eats and the number of cookies Joey eats. Identify the independent and dependent variables.

We can represent the situation with the expression s = 3j

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Use the table below to answer question.**y** when **x = 4**.

11

2(4) + 3

Use the table below to answer question.

When **x** increases, **y ____________.****A.** Increases**B.** Decreases**C.** Stays the same

**A.** Increases

**y** increases with **x**.

Use the table below to answer question.

Which letter is the dependent variable?

**Y**

**y** changes based on the value of** x**.

Use the table below to answer question.

Which letter is the independent variable?

**X**

**x** is independent of any other variable

Use the table below to answer question.

Solve for **y** in the table. Then graph the points on the coordinate plane below.

Plug in the values from the table for **x** to determine **y** and graph

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