Chapter 1
Press
ENTER to find the input at the point of intersection.
Because x is the number of years after 1980, the answer to the
question posed in part c of Example 3 is either 1984 or 1985.
The price had not exceeded $6 in 1984, so the answer to the
question is 1985. Carefully read the question you are asked.
Notice that the natural gas prices could have also been modeled with a cubic equation by
renumbering the input data so that x is the number of years after 1900.
Return to the data and add 80 to each
input value so that
L1 represents the
number of years after 1900 rather
than the number of years after 1980.
Return to the home screen. Press
2nd ENTER (ENTRY) to return the
instruction “
Cubic Y1” to the screen.
Press
ENTER . Press Y= and have
Y2 = 6.
Because the data are realigned, draw a graph of the equation with ZOOM 9 [ZoomStat] rather
than
GRAPH . Graphically finding where Y1 first exceeds 6 is done exactly as was previously
discussed, but you need to carefully interpret the solution.
Because x is now the number of years
after 1900, the answer to the question
posed in part c of Example 3 is still
interpreted as 1985.
Copyright © Houghton Mifflin Company. All rights reserved.
42
To Next Page
Loading...
Need help?
General
