- Evaluating and Writing Expressions
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- Evaluating an Algebraic Expression With Addition or Subtraction
- Evaluating an Algebraic Expression With Multiplication or Division
- Evaluating an Algebraic Expression With Two Operations
- Evaluating a Formula
- Evaluating an Expression With One Operation and an Exponent
- Writing a One-Step Expression For a Real-World Situation
- Translating a Phrase Into a One-Step Expression
- Translating a Phrase Into a Two-Step Expression

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# Evaluating an Algebraic Expression With Addition or Subtraction

An **algebraic expression** is a combination of letters, numbers and operations without an equation or inequality sign. Here, letters represent the variables and operations can be addition, subtraction, multiplication and division.

**Evaluating an algebraic expression** means replacing the letters or variables in the expression with the values or numbers given.

In this lesson, we are evaluating algebraic expressions involving addition or subtraction operations only.

Evaluate the algebraic expression 12 + x; for x = 2

### Solution

**Step 1:**

To evaluate the given algebraic expression, we replace x with 2 in the expression.

12 + x = 12 + 2 = 14

**Step 2:**

So, for x = 2, 12 + x = 14

Evaluate the algebraic expression x − 3; for x = 11

### Solution

**Step 1:**

To evaluate the given algebraic expression, we replace x with 11 in the expression.

x − 3 = 11 − 3 = 8

**Step 2:**

So, for x = 11, x − 3 = 8

Evaluate the algebraic expression y + 5; for y = 9

### Solution

**Step 1:**

To evaluate the given algebraic expression, we replace y with 9 in the expression.

y + 5 = 9 + 5 = 14

**Step 2:**

So, for y = 9, y + 5 = 14