Algebraic Expressions - Substitution

Front

What is an algebraic expression?

Back

An algebraic expression is a mathematical phrase that can include numbers, variables (like x or y), and operations (like addition, subtraction, multiplication, and division).

Front

What does substitution mean in algebra?

Back

Substitution in algebra refers to replacing a variable with a specific value to evaluate the expression.

Front

Evaluate the expression 3ab when a = 3 and b = 4.

Back

36

Front

Evaluate the expression 18 ÷ 2a when a = 3.

Back

3

Front

Evaluate the expression 2a when a = 3.

Back

6

Front

Evaluate the expression 3x + 8 when x = 2.

Back

14

Front

Evaluate the expression y + x - z when x = 3, y = -2, and z = -4.

Back

-3

Front

What is the value of a variable in an expression?

Back

The value of a variable in an expression is the number that replaces the variable when evaluating the expression.

Front

What is the purpose of evaluating an expression?

Back

The purpose of evaluating an expression is to find its numerical value by substituting the variables with their respective values.

Front

What is the difference between a constant and a variable in algebra?

Back

A constant is a fixed value that does not change, while a variable is a symbol that represents an unknown value.