Do Now Solve. 1. x – 17 = y + 11 = = x = -108

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Do Now Solve. 1. x – 17 = y + 11 = = x = x – 9 = 20 x = 49 y = 30 w 5 w = 90 x = 9 x = 29 Hwk: p29 odd, Test this Friday.

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Presentation transcript:

Do Now Solve. 1. x – 17 = 32 2. y + 11 = 41 3. = 18 4. -12x = -108 -5 w = -90 x = 9 x = 29

Learn to solve one-step equations that contain decimals.

Remember! You can solve an equation by performing the same operation on both sides of the equation to isolate the variable.

· ·- 4.8 Example A Solve. n – 2.75 = 8.3 a + 32.66 = 42 + 2.75 +2.75 –32.66 –32.66 a = 9.34 n = 11.05 x -4.8 · ·- 4.8 = 5.4 -9 = 3.6d -4.8 3.6 3.6 x = -25.92 -2.5 = d

· · 3.5 You Try Solve. n – 1.46 = 4.7 a + 27.51 = 36 + 1.46 +1.46 –27.51 –27.51 a = 8.49 n = 6.16 x 3.5 · 9 = -2.5d = -2.4 · 3.5 3.5 -2.5 -2.5 x = -8.4 -3.6 = d

Six boxes can be stacked in the space. Extra Example A board-game box is 2.5 inches tall. A toy store has shelving measuring 15 inches vertically in which to store the boxes. How many boxes can be stacked in the space? 2.5b = 15 2.5 2.5 Understand the Problem - Find the number of boxes that can be placed on the shelf. List the important information:• Each board-game box is 2.5 inches tall. • The store has shelving space measuring 15 inches. Make a Plan The total height of the boxes is equal to the height of one box times the number of boxes. Since you know how tall the shelf is you can write an equation with b being the number of boxes. b = 6 Six boxes can be stacked in the space.

Extra Example A canned good is 4.5 inches tall. A grocery store has shelving measuring 18 inches vertically in which to store the cans. How many cans can be stacked in the space? 4.5c = 18 4.5 4.5 c = 4 Four cans can be stacked in the space.

Lesson Quiz Solve. 1. x – 14.23 = 19.5 2. 12.6c = –103.32 3. 4. m + 12.97 =–14.35 5. The French Club is selling coupon books for $8.25 each. How many books must be sold to bring in $5,940? x = 33.73 c = –8.2 x = 6.1 x = 56.73 9.3 m = –27.32 720 books

Lesson Quiz for Student Response Systems 1. Solve. m + 13.55 = –15.45 A. m = –28 B. m = –29 C. m = –30 D. m = –31

Lesson Quiz for Student Response Systems 2. Solve. x – 16 = 18.7 A. x = –35.13 B. x = –2.27 C. x = 2.27 D. x = 35.13

Lesson Quiz for Student Response Systems 3. Solve. 14.8a = –102.12 A. a = 7.3 B. a = 6.9 C. a = –6.9 D. a = –7.3

Lesson Quiz for Student Response Systems 4. Solve. — = 7.2 A. x = 56.13 B. x = 61.92 C. x = 63.02 D. x = 64 x 8.6

Lesson Quiz for Student Response Systems 5. A fashion show ticket costs $7.75 per person. How many fashion show tickets must be sold to generate $4,805? A. 600 tickets B. 620 tickets C. 640 tickets D. 660 tickets