71

 PAGE: 221 SET: Exercises PROBLEM: 71

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.

TESTIMONIALS
 "I want to tell you that our students did well on the math exam and showed a marked improvement that, in my estimation, reflected the professional development the faculty received from you. THANK YOU!!!" June Barnett "Your site is amazing! It helped me get through Algebra." Charles "My daughter uses it to supplement her Algebra 1 school work. She finds it very helpful." Dan Pease
 Tweets by @mathskeydotcom

QUESTIONS? LET US HELP.