Lesson 21 - Inequalities

An inequality ________________.

• compares two expressions using less than or greater than symbols, < and >

• a letter or symbol used to represent an unknown value

• compares two expressions by showing they are equal to each other

• has only one solution

Which of the following inequalities matches this phrase: Twenty-four is greater than three plus eight

• 24 < 3 + 8

• 24 > 3 + 8

• 24 = 3 + 8

• 24 ? 3 + 8

Which of the following inequalities matches this phrase:

x is less than or equal to four

• x > 40

• x > 4

• 4 < x

• x ≤ 4

What does the symbol in this inequality mean? x ≤ 4

• less than

• greater than

• less than or equal to

• greater than or equal to

What does the symbol in this inequality mean? 14 > 8

• greater than

• less than or equal to

• less than

• greater than or equal to

When you graph an inequality on a number line, what kind of circle needs to be used if there is a < or > symbol?

• open circle

• closed circle

When you graph an inequality on a number line, what kind of circle needs to be used if there is a ≥ or ≤ symbol?

• open circle

• closed circle

Which inequality has been graphed this number line?

• x < 6

• x ≥ 6

• x > 4

• x ≥ 9

Which inequality has been graphed this number line?

• x < 3

• x = 7

• x < 7

• x > 9

Write an inequality for this scenario: Marta's luggage must weigh less than 45 lbs if she wants to bring it on her flight. Use x to represent how much her luggage weighs.