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More Lessons for Grade 7 Math

Math Worksheets

Examples, solutions, videos, worksheets, and activities to help Algebra 1 or grade 7 students learn how to evaluate algebraic expressions.
**How to Evaluate Expressions with Two Variables?**

**Evaluating Algebraic Expressions**
**How to Evaluate Expressions with One Variable?**

**Basic Mathematics & Algebra : Substituting Values Into an Algebraic Expression**

Substituting values into an algebraic expression in mathematics is easier to do if the numbers the values represent are given ahead of time.

More Lessons for Grade 7 Math

Math Worksheets

Examples, solutions, videos, worksheets, and activities to help Algebra 1 or grade 7 students learn how to evaluate algebraic expressions.

We can evaluate an algebraic expression for different values of the variable.

To evaluate 3*x* + 1 for *x* = −2, we substitute −2 in place of *x*

3(−2) + 1 = −6 + 1 = −5

Remember to use order of operations to evaluate and be careful with the minus signs.

**Evaluating Algebraic Expressions**

How to evaluate an algebraic expression when values are given for the variable(s)?

Examples:

1. Evaluate x + 3 for x = 7

2. Evaluate x^{2} + x - 3 for x = 2

3. Evaluate y^{2} + x^{3} + 7 for y = 2, x = 1

4. Evaluate 5 - x^{2} for x = -2

5. Evaluate (3x)(5y) for x = -1, y = 2

6. Evaluate -7x^{2} -5 + y^{2} - x for x = -2, y = 4

7. Evaluate 3x^{2} ÷ 12 + y for x = 4, y = -7

Substituting values into an algebraic expression in mathematics is easier to do if the numbers the values represent are given ahead of time.

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