# One-Variable Equations

## Overview

We can solve one-variable equations and inequalities by plugging in the unknown

number. For example…

In which equation does **x = 4**?

A. 2 + x = 4

B. 2 + x = 6

Since we know the value of x, we simply need to plug it into each equation to see if it gives us the correct result.

**
Choice A** is incorrect because we do not get the correct answer when we plug the number in for

**x**.

**Choice B**is correct because we do get the correct answer when we plug the number in for

**x**.

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In which equation does **x = 4**?

**A.** **B.** **C.**

x + 7 = 11

(4) + 7 = 11

In which equation does **n = 7**

**A.** 3n + 4 = 10**B.** 5n – 4 = 10**C.** n + 3 = 10

n + 3 = 10

(7) + 3 = 10

In which equation does **y = 14**?

**A.** **B.** **C.**

In which equation does **p = 6**?

**A.** p – 2 = 4**B.** p + 5 = 4**C.** p x 3 = 4

p – 2 = 4

(6) – 2 = 4

In which equation does **w = 9**?

**A.** **B.** **C.**

w + 5 = 14

(9) + 5 = 14

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