HP 39gs

E
E
x
x
a
a
m
m
p
p
l
l
e
e
3
3
Solve the system of equations:
−+
73
xy z
=
5
⎫
⎪
−
5
x z
=
2
⎬
y z
= −
1
⎭
−+
22
⎪
Although it may not be obvious at first glance, this system of equations
corresponds to a ‘spindle’ of planes in 3-space as shown in the diagram
above right. This situation allows infinite solutions anywhere along the
line of intersection of the three planes.
As you can see right, the calculator has correctly indicated the situation.
151