hp40g+.book Page 6 Friday, December 9, 2005 1:03 AM
Exercise 5
17x + 20y = 90
10x + 25y = 90
Press , select
LINSOLVE and press .
Enter 17 | X | 20 |
Y90
10
X 25 | Y |
90X
Y
If you are working in step by step mode, pressing produces the result at the right.
Press again to produce the next step in the solution:
Press again to produce the reduction result:
Pressing again produces the final result:
14
If you select
you get X = 2 and Y
=2.8. In other words, the price of one biscuit is 2 cents, and the price of one macaroon is 2.8 cents.
Suppose that A and B are points having the coordinates
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