Unit 6, Lesson 13

Reintroducing Inequalities

Grade 7

Practice

For each inequality, find two values for $x$ that make the inequality true and two values that make it false.

Here is an inequality: $\text-3x > 18$.

List some values for $x$ that would make this inequality true.
How are the values that make the inequality $\text-3x \geq 18$ true different from the values that make $\text-3x > 18$ true?

Here are the prices for movie posters at a theater:

You have a coupon that makes the price of a large poster \$13.00. For what percent off is the coupon?
Your friend buys a medium poster for \$10.31 with a 30% off coupon. What is the price of a medium poster without a coupon?
Your friend has a 15% off coupon and $10. What is the largest poster that your friend can afford, and how much money will be left over after the purchase?

Select all the stories that can be represented by the diagram.

Andre studies 7 hours this week for end-of-year exams. He spends 1 hour on English and an equal number of hours each on math, science, and history.
Lin spends \$3 on 7 markers and a \$1 pen.
Diego spends \$1 on 7 stickers and 3 marbles.
Noah shares 7 grapes with 3 friends. He eats 1 and gives each friend the same number of grapes.