Evaluate Expressions with Substitution

Evaluate the expression 4(x - 2) + 2y when x = 5 and y = 3.

• 18

• 10

• 14

• 20

What is the value of a numerical expression?

• The result of replacing some (or all) of the numbers in a numerical expression with variables.

• The number found by evaluating the expression

• A symbol (such as a letter) that represents a number

• Each summand of an expression in expanded form

Bonus: What is 4y(5)

• 9y

• 20

• 20y

• 9

What is an equivalent expression?

• The number before the variable

• An expression in expanded form with all like terms collected.

• Both expressions evaluate to the same number, no matter the substitution of numbers in variables.

• A number, or it is any combination of sums, differences, products, or divisions of numbers that evaluates to a number.

Plugging in a number for a variable is called

• operation

• evaluation

• substitution

• solving

What is it called when you want to replace the variable in an expression with a number, and then SOLVE IT.

• Evaluate

• Expression

• Order of Operations

What is it called when you want to solve or replace the unknown quantity in an equation with the value?

• Simplify

• Substitution

• Evaluate

• Solve

What is the variable in the following expression: 7g - 15

• 7

• g

• -15

• 15

What is the number that multiplies to a variable?

• Term

• Coefficient

• Constant

• Variable

What is a combination of numbers, variables, and symbols that illustrate a mathematical relationship; no equal sign

• Equation

• Inequality

• Like-Term

• Expression