Practice Exam Answers

 

 

  1. –4

 

  2. 27

 

4.  

 

5.   

 

6.    

 

7.

 

  1. x = 14 or x = -4

 

  1. x = 3 or x = 2

 

  1.  or        

                                                              -3                  13

  1. Domain:

 

                -5                   5

             Range:

 

                                   

                                                    -5                   5

 

 

        12.

 

        13.   ;           

 

14.      x = -4

15.      1.516551…

 

16.      x = 4,    y = -3

17.      x = 17,  y = -2

18.      ,        ,            

 

Instead of that one, solve this one by row reduction using a 2x2 matrix:

 

 

 

 

 

 

 

 

   

 

     and       :

 

 

               

 

This means that  , or y = 4

Now if we plug 4 in for y in one of the original equations:

 

X – 2(4) = -6

 

X = -6 + 8   (adding 8 to both sides)

 

X = 2.   Let’s check:   3x + y = 3(2) + 4 = 6+4 = 10. Ö   

 

 

19.      B

 

 

20.      none of these!   The correct graph looks like this: