The arithmetic sequence is .
Find th term of the arithmetic sequence :
Here, and .
The formula for th term of the arithmetic sequence : .
(Subtitute and )
(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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