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 ----- , and press 5

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

(–1, 3) and (–3,–1) respectively, and where the unit of measure is the centimetre.

16-6

 

 

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