evaluate expressions by substitution

Front

What does it mean to evaluate an expression by substitution?

Back

To evaluate an expression by substitution means to replace the variable in the expression with a given number and then perform the arithmetic operations.

Front

Evaluate the expression: 3x + 8 if x = 2.

Back

14

Front

What is the first step in evaluating an expression with a variable?

Back

The first step is to substitute the variable with the given value.

Front

Evaluate the expression: 18 ÷ 2a if a = 3.

Back

3

Front

What is the expression for the sum of a number and 8?

Back

The expression is x + 8.

Front

Evaluate the expression: 6h + 30 if h = 6.

Back

66

Front

What does the term 'expression' mean in mathematics?

Back

An expression is a combination of numbers, variables, and operations without an equality sign.

Front

Evaluate the expression: 2(a - 5) + 2 if a = 10.

Back

12

Front

What is the difference between an expression and an equation?

Back

An expression does not have an equality sign, while an equation does.

Front

Evaluate the expression: 7y - 3y if y = 2.

Back

8