Consider the sequence
u0 = 18
un = un-1 -3 where n ≥ 1
a. Graph the sequence.
b. What is the slope of the line that contains the points? How is that related to the common difference of the sequence?
c. What is the y-intercept of the line that contains these points? How is it related to the sequence?
d. Write the equation of the line that contains these points.