Linear & Quadratic Functions: Solving Graphically

                    Lesson 1

                                                                                                                                                                          

                                                            Problem:                  Solve graphically:

 

y = x - 4x - 6

y = x + 1 

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                                                             Solution                    Substitute random values for x and substitute in quadratic equation to find the value of y:

                           Step 1:                                                                                                          

x

- 1

0

1

y

-1

- 6

- 9

                     

                                                                                Solution                          Substitute random values for x and substitute in quadratic equation to find the value of y:

            Step 2:                                                                                       

x

-1

0

1

y

0

1

2

 

                                                                               Solution                          Plot the graph and Find the points where the two graphs intersect

            Step 3:     

 

                                                            Solution                          The answer is: Solution set is: ()

            Step 4:           

  Complete

                                                                           

                                                                                                                              

                                                             Try two practice problems:  

 

                                                                                               Solve graphically: 

 

A.

y = x -8x - 4

y = x + 5

B.

y = x2 + 7x + 3

y = x - 4

 

 

                                                                                            

        

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