Warm-Up

1
Warm-Up

• Solve the equation below
• 8x 2(x3) 9x 9
• Write each fraction as a decimal rounded to the
  nearest hundredth. Then write as a percent.

2
Homework Review

• P. 157 18-40E
• 18. x-27
• 20. m1/2
• 22. No Solution
• 24. No Solution
• 26. p1
• 28. m-1
• 30. t5/6

• 32. Identity (All real numbers)
• 34. y5
• 36. b-2
• 38. n1/2
• 40. Identity (All real numbers)

3
3.6 Solving Decimal Equations

• SWBAT find exact and approximate solutions of
  equations that contain decimals

4

• Sometimes in real life exact solutions are not
  always practical and you must use rounded
  solutions.

5
Example (p. 166 ex 1)

• Three people want to share equally in the cost of
  a pizza. The pizza costs 12.89. You can find
  each persons share by solving 3x12.89.

6
Example

• Solve -38x-39118. Round to the nearest
  hundredth.
• Note When you substitute a rounded answer back
  into the original equation the two sides may not
  be exactly equal but they should be very close.

7
Changing Coefficients

• An equation involving decimals can be rewritten
  as an equivalent equation with only integer terms
  and coefficients.

8
Example

• Solve 4.5 - 7.2x 3.4x 49.5x. Round to the
  nearest hundredth.

9
Example

• Solve 1.67x 3.2 3x 4.31. Round to the
  nearest thousandth.

10
Homework

• P. 169
• 20-30E (give exact answer and rounded answer)
• 32- 42E (only rounded answers)