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Chapter 4
Graphing Features
In this chapter, the graphing features of the calculator are described. It should be
noted that the following examples assume that the angle mode is set Rad (radian), the
default angle unit of the calculator. If set to degree or grad, some unexpected results
will be obtained.
1. Try it!
There are two taxi cab companies in your city, Tomato Cab and Orange Cab,
with different fare systems. The Tomato Cab charges $2.00 upon entering the
taxi cab, and $1.80 for each mile the taxi travels. The Orange Cab, on the other
hand, charges $3.50 plus $1.20 per mile. This means that taking the Tomato
Cab will initially cost less than
going with the Orange Cab, but
will be more expensive as you
travel longer distances.
Suppose you need to go to a place
3 miles away from where you are
now. Which cab company should
you take to save money?
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Two math expressions can be derived from the above fare
systems. If "y" represents the cost, while "x" represents the
mileage, then:
y = 2 + 1.8x .................... Tomato Cab's fare system
y = 3.5 + 1.2x ................ Orange Cab's fare system
Use the calculator's graphing capabilities to figure out the
approximate point where the Orange Cab gets ahead of the
Tomato Cab, in terms of cost performance.
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