evaluate expressions by substitution

Front

What does it mean to evaluate an expression by substitution?

Back

Evaluating an expression by substitution means replacing the variables in the expression with their given values and then performing the calculations.

Front

Evaluate the expression: 4y - 5 when y = 6.

Back

19

Front

Evaluate the expression: 2r + 1 when r = 3.

Back

7

Front

Evaluate the expression: 4y when y = 3.

Back

12

Front

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

Back

12

Front

Evaluate the expression: m² when m = 5.

Back

25

Front

What is a variable in mathematics?

Back

A variable is a symbol, often a letter, that represents a number that can change or vary.

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (like +, -, *, /) that represents a value.

Front

What is the order of operations in mathematics?

Back

The order of operations is a set of rules that determines the sequence in which calculations are performed: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

Front

Evaluate the expression: 3x + 4 when x = 2.

Back

10