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lesson 14.notebook                                                              September 17, 2012

            Lesson 14:

            *FYI...
               Sometimes we use a letter to represent an unidentified 
            number.


            expression­­>        5x
                          constant     variable
                             or
                         coefficient


            **To evaluate an expression...substitute numbers in place of the 
            variable(s) and calculate the result!




                                                                                                     1
lesson 14.notebook                                                             September 17, 2012


            Examples ­ Lesson 14

            A)  A formula for the perimeter of a rectangle is P = 2l + 2w.  
            Find P when l is 15 cm and w is 12 cm.




            B)  In the expression 4ac, what is the constant?




                                                                                                    2
lesson 14.notebook                                                   September 17, 2012

            C)  Evaluate 4ac, when a = 1 and c = 12.



            Solve each equation by inspection.  Check your answer.
            D)  w  +  5  =  16                   check:




            E)  m ­ 6  =  18                     check:




                                                                                          3
lesson 14.notebook                     September 17, 2012

            F)  25 ­ n = 11   check:




            G)  5x  =  30     check:




            H)  d = 8         check:
                   4




                                                            4
lesson 14.notebook                               September 17, 2012


             I)  12  =  6          check:
                    z


             J)  2a  ­  1  =  9    check:



             K)  20  =  3f  ­  1        check:



             L)  2r  +  3  =  15        check:




                                                                      5

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8th pre alg -L14--sept17

  • 1. lesson 14.notebook September 17, 2012 Lesson 14: *FYI... Sometimes we use a letter to represent an unidentified  number. expression­­> 5x constant variable or coefficient **To evaluate an expression...substitute numbers in place of the  variable(s) and calculate the result! 1
  • 2. lesson 14.notebook September 17, 2012 Examples ­ Lesson 14 A)  A formula for the perimeter of a rectangle is P = 2l + 2w.   Find P when l is 15 cm and w is 12 cm. B)  In the expression 4ac, what is the constant? 2
  • 3. lesson 14.notebook September 17, 2012 C)  Evaluate 4ac, when a = 1 and c = 12. Solve each equation by inspection.  Check your answer. D)  w  +  5  =  16 check: E)  m ­ 6  =  18 check: 3
  • 4. lesson 14.notebook September 17, 2012 F)  25 ­ n = 11 check: G)  5x  =  30 check: H)  d = 8 check:        4 4
  • 5. lesson 14.notebook September 17, 2012 I)  12  =  6 check:        z J)  2a  ­  1  =  9 check: K)  20  =  3f  ­  1 check: L)  2r  +  3  =  15 check: 5