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1-21-11

1-21-11. Bellwork #40 HW, red pen, pencil, book on desk. Multi-Step equations with fractions and decimals. Lesson 7-3 p.345. Multi-step equations.

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1-21-11

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  1. 1-21-11 • Bellwork #40 • HW, red pen, pencil, book on desk.

  2. Multi-Step equations with fractions and decimals Lesson 7-3 p.345

  3. Multi-step equations • We have added to the level of difficulty by solving equations with 2 steps, by combining like terms first, and by using the distributive property. • Now we increase the difficulty again by solving equations with fractions and decimals.

  4. Example • For example: Our steps are the same in this problem. First we add six to both sides, then we multiply both sides by 3/2 and then solve. Let’s try it.

  5. Let’s try +6 +6

  6. Another example • Sometimes we have to distribute the fraction like this:

  7. Try This • 1.2n + 3.4 = 10 • (a + 6) = 2

  8. Try This • 1.2n + 3.4 = 10 n = 5.5 • (a + 6) = 2

  9. Try This • 1.2n + 3.4 = 10 n = 5.5 • (a + 6) = 2 a = -5/2

  10. Another example First add 8 to both sides +8 +8 Next multiply both sides by 2 (2) (2) Subtract 14 from both sides and solve. -14 -14 N = 22

  11. Try This

  12. Try This X = 38

  13. Try This X = -38 R = 97

  14. Clear the equation of fractions • Multiply each side by the LCM to get rid of the fraction or fractions. • Study example #3 on p.346

  15. Agenda 1-21-10 • PA#4 • P.348 #14-22

  16. 1-24-11 • Please start Bellwork Quiz • HW, red pen, pencil on desk.

  17. Agenda 1-24-11 • PA#5 • Workbook pages: • p.57 #5-17 odd, • p. 58 #1-13 odd, and • p.59 #5-15 odd • Show work in spiral notebook • Quiz tomorrow on Lessons 7-1, 7-2, and 7-3.

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