HP 40gs User Manual page 280

Exercise 5
16-6
Press , select
LINSOLVE and press
Enter 17 X
Y 90
X 25
90
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.
17x + 20y = 90
10x + 25y = 90
.
20
10
Y
X
Y
Step-by-Step Examples