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Step-by-Step Examples 16-5
Press to select the entire
equation, then press
to reduce it to
.
Press , select
FACTOR, press and
then . The result is
as shown at the right.
Now press , select
SOLVEVX, press and
press . The result is
shown at the right.
Press to display
CAS history, select D or a
version of it, and press .
Press , select SUBST,
press and, then
complete the second
argument:
Press to select
the entire expression and
then to obtain the
intermediate result shown.
Press once more to
yield the result: .
Therefore, when
.
Example 4 A baker produces two assortments of biscuits and
macaroons. A packet of the first assortment contains 17
biscuits and 20 macaroons. A packet of the second
assortment contains 10 biscuits and 25 macaroons. Both
packets cost 90 cents.
Calculate the price of one biscuit, and the price of one
macaroon.
Solution: Let x be the price of one biscuit, and y the
price of one macaroon. The problem is to solve:
9x
2
6x–80–
x 5–=
175
D 175=
x 5–=
hp40g+.book Page 5 Friday, December 9, 2005 1:03 AM