Algebraic Expressions - Substitution

Front

What is an algebraic expression?

Back

An algebraic expression is a mathematical phrase that can include numbers, variables (like a, b, c), 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: a + b when a = 3 and b = 4.

Back

7

Front

Evaluate the expression: 2a when a = 3.

Back

6

Front

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

Back

-3

Front

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

Back

36

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 result of multiplying a variable by a number?

Back

Multiplying a variable by a number scales the value of the variable by that number.

Front

If a = 2, what is the value of 5a + 3?

Back

13

Front

What is the difference between an expression and an equation?

Back

An expression is a combination of numbers and variables without an equality sign, while an equation states that two expressions are equal.