Solving Inequalities Using Addition or Subtraction

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Presentation transcript:

Solving Inequalities Using Addition or Subtraction Section 2.2 Solving Inequalities Using Addition or Subtraction

Start Thinking Think-Pair-Share (1 min-3 min-2 min) (on your warm up sheet) When making a purchase, it is important to have more money than the cost of the merchandise. Suppose you have a $20 bill and have already placed bread, eggs, and cereal into your cart. How could you represent the amount of money you have left to spend on milk with an inequality?

Warm Up (4 minutes on Whiteboards) Solve the Equation. 1. 2. 3.

Check Your Warm Up 1. 3 2. -2 3. x—4 or x=10

Exploration 1 (6 minutes on page 33 in your journals) The National Collegiate Athletic Association (NCAA) uses the following formula to rank the passing efficiencies P of quarterbacks.

Exploration 1 Cont’d

Exploration 1 Cont’d Determine whether each inequality must be true. Explain why!

Day 2 Warm Up (On your warm up sheet) Summarize the video in 1-3 sentences. https://www.bigideasmath.com/protected/content/stem/video.php?id=100828677

Communication ( 5 minutes in your journal) How can you use addition or subtraction to solve an inequality? Solve each inequality.

Let’s Try Graphing (4 minutes) (either in the extra space in the journal or on whiteboards) Now that you have solved these inequalities, try graphing them.

Addition Property of Inequality

Subtraction Property of Inequality

Representing Linear Inequalities

Solving Real Life Problems A circuit overloads at 1800 watts of electricity. You plug a microwave oven that uses 1100 watts of electricity into the circuit. Write and solve an inequality that represents how many watts you can add to the circuit without overloading the circuit.

Solving Real Life Problems A circuit overloads at 1800 watts of electricity. You plug a microwave oven that uses 1100 watts of electricity into the circuit. In addition to the microwave oven, which of the following appliances can you plug into the circuit at the time without overloading the circuit?

Closure (4 minutes on your closure sheet) Solve the Inequality and graph the solution.

Homework  Pages 36-37 Problems 1-7

Bonus Time? (On Whiteboards) Write the sentence as an inequality. Then solve the inequality.