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71

Step-by-step Answer
PAGE: 221SET: ExercisesPROBLEM: 71
Please look in your text book for this problem Statement

The arithmetic sequence is .

Find th term of the arithmetic sequence :

Here, and .

The formula for th term of the arithmetic sequence : .

          (Subtitute and )

               (Distributive property :)

                       (Simplify)

Thus, the related function is .

Graph :

Draw a coordinate plane.

Graph the function to determine the function is proportional or nonproportional.

Observe the graph :

The graph of the line does not passes through the origin .

Therefore, the function is nonproportional.

Therefore, the function does not describe a direct variation.

The function is ; It is nonproportional ;  The function does not describe a direct variation.



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