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1-27-10

1-27-10. Please start Bellwork 43 Homework, red pen, pencil, book on desk. Solving Two-Step Inequalities. Lesson 7-6 p.360. 2-step inequalities. Earlier in the year, we learned how to solve inequalities. Remember what the open circle And closed circle represent?.

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1-27-10

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  1. 1-27-10 • Please start Bellwork 43 • Homework, red pen, pencil, book on desk.

  2. Solving Two-Step Inequalities Lesson 7-6 p.360

  3. 2-step inequalities • Earlier in the year, we learned how to solve inequalities. Remember what the open circle And closed circle represent?

  4. 2-step inequalities • Earlier in the year, we learned how to solve inequalities. Remember what the open circle And closed circle represent? Open circle represents < or > and Closed circle represents < or >

  5. 2-step inequalities • We also learned that if an inequality was greater than we highlighted the right (or greater) side of the number line: • If the inequality was less than we highlighted the left (or less) side of the number line:

  6. 2-step inequalities • When we solve 2-step inequalities, we solve just as if the problem had an equals sign. • For example consider the problem: 2y – 3 < -5

  7. Example • 2y – 3 < -5 +3 +3 add 3 to both sides 2y<-2 2 2 divide both sides by 2 y < -1 graph -3 -2 -1 0 1 2 3

  8. Another example • Don’t forget: if you multiply or divide by a negative number, you must reverse the inequality sign. • -9 > x + 6 -3 -9 > x + 6 -6 -3 -6 subtract 6 (-3)-15 > x (-3) -3 multiply by -3 45 < x x > 45

  9. Try This 5a – 9 > 11 17 + 1 c <14 2

  10. Try This 5a – 9 > 11 a > 4 17 + 1 c <14 2

  11. Try This 5a – 9 > 11 a > 4 17 + 1 c <14 c < -6 2

  12. Try these too 6 – x > 3 8.3 < -0.5b – 2.7

  13. Try these too 6 – x > 3 x < 3 8.3 < -0.5b – 2.7

  14. Try these too 6 – x > 3 x < 3 8.3 < -0.5b – 2.7 b < -22

  15. Agenda 1-27-11 • PA #8 • P.362 #9-27 odd, 30

  16. Agenda 1-28-11 • PA #9 • Workbook 61 & 62 evens

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