# 11-1 Solving Two-Step Equations. Warm Up Problem of the Day Lesson Presentation Lesson Quizzes

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1 Warm Up Problem of the Day Lesson Presentation Lesson Quizzes

2 Warm Up Solve. 1. n + 9 = x = z = y 8 n = 8 x = 7 z = 16 = 9 y = 72

3 Problem of the Day Rhombus ABCD has a perimeter of 19 cm. If you subtract 1.88 from the length of side BC and then divide the result by 7, you get What is the length of side BC? 19 4 = 4.75 cm (All sides of a rhombus are the same length.)

4 Learn to solve two-step equations.

5 When you solve equations that have one operation, you use an inverse operation to isolate the variable. n + 7 = n = 8 You can also use inverse operations to solve equations that have more than one operation. 2x + 3 = x = 20 You need to use another operation to isolate x.

6 Additional Example 1A: Solving Two-Step Equations Using Division Solve. Check each answer. 9c + 3 = 39 9c + 3 = c = 36 9c 9 = 36 9 c = 4 Subtract 3 from both sides. Divide both sides by 9.

7 Additional Example 1A Continued Check. 9c + 3 = 39 9(4) + 3? 39 =? = ? = Substitute 4 for c. 4 is a solution.

8 Helpful Hint Reverse the order of operations when solving equations that have more than one operation.

9 Additional Example 1B: Solving Two-Step Equations Using Division Solve. Check the answer. 34 = 4m 6 34 = 4m = 4m 28 4 = 4m 4 7 = m Add 6 to both sides. Divide both sides by 4.

10 Additional Example 1B Continued Check. 4m 6 = 34 4(7) 6? 34 = 28 6? 34 =? = Substitute 7 for m. 7 is a solution.

11 Check It Out: Example 1A Solve. Check the answer. 7c + 6 = 48 7c + 6 = c = 42 7c 7 = 42 7 c = 6 Subtract 6 from both sides. Divide both sides by 7.

12 Check It Out: Example 1A Continued Check. 7c + 6 = 48 7(6) + 6? 48 =? = ? = Substitute 6 for c. 6 is a solution.

13 Check It Out: Example 1B Solve. Check the answer. 6m 8 = 50 6m 8 = m = 42 6m 6 = 42 6 m = 7 Add 8 to both sides. Divide both sides by 6.

14 Check It Out: Example 1B Continued Check. 6m 8 = 50 6(7) 8? 50 = 42 8? 50 =? = Substitute 7 for m. 7 is a solution.

15 Additional Example 2A: Solving Two-Step Equations Using Multiplication Solve. 6 + y 5 = 21 y = = 15 (5) y 5 y 5 = (5)15 y = 75 Subtract 6 from both sides. Multiply both sides by 5.

16 Additional Example 2B: Solving Two-Step Equations Using Multiplication Solve. x 7 11 = 9 x 7 11 = x 7 (7) x 7 = 20 = (7)20 x = 140 Add 11 to both sides. Multiply both sides by 7.

17 Check It Out: Example 2A Solve. 8 + y 2 = 48 y = = 40 (2) y 2 y 2 = (2)40 y = 80 Subtract 8 from both sides. Multiply both sides by 2.

18 Check It Out: Example 2B Solve. x 5 x 5 x 5 (5) 31 = = x 5 = 50 = (5)50 x = 250 Add 31 to both sides. Multiply both sides by 5.

19 Additional Example 3: Consumer Math Application Jamie rented a canoe while she was on vacation. She paid a flat rental fee of \$85.00, plus \$7.50 each day. Her total cost was \$ For how many days did she rent the canoe? Let d represent the number of days she rented the canoe. 7.5d + 85 = d = d = d = 6 Jamie rented the canoe for 6 days. Subtract 85 from both sides. Divide both sides by 7.5.

20 Check It Out: Example 3 Jack s father rented a car while they were on vacation. He paid a rental fee of \$20.00 per day. He paid \$25.00 for mileage and his total bill for renting the car was \$ For how many days did he rent the car? Let d represent the number of days he rented the car. 20d + 25 = Subtract 25 from both sides. 20d = d = 140 Divide both sides by d = 7 Jack s father rented the car for 7 days.

21 Lesson Quizzes Standard Lesson Quiz Lesson Quiz for Student Response Systems

22 Lesson Quiz Solve. Check your answers. 1. 6x + 8 = y 14 = 28 y = 3 m = = m 4. v 8 6 = 8 x = 6 v = Last Sunday, the Humane Society had a 3-hour adoption clinic. During the week the clinic is open for 2 hours on days when volunteers are available. If the Humane Society was open for a total of 9 hours last week, how many weekdays was the clinic open? 3 days

23 Lesson Quiz for Student Response Systems 1. Solve 7q + 5 = 68. A. q = 6 B. q = 7 C. q = 8 D. q = 9

24 Lesson Quiz for Student Response Systems 2. Solve 17h 10 = 75. A. h = 5 B. h = 7 C. h = 9 D. h = 10

25 Lesson Quiz for Student Response Systems 3. Solve A. z = 72 B. z = 86 C. z = 90 D. z = 104

26 Lesson Quiz for Student Response Systems 4. A taxi charges an airport pickup fee of \$3 plus \$1.50 for each mile traveled. If a taxi ride cost John \$36, how many miles did John travel in the taxi? A. 21 miles B. 22 miles C. 31 miles D. 32 miles

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