HP35S: a new 2*2 solve bug?

[Roberto Volpi]

Hi all:

fighting with a simple 2*2 linear system with the help of our beloved HP35S I am observing a possible new bug.

I was trying to solve the following linear system of 2 unknowns:

s-t=0
-2s-3t=-20

Nothing hard to solve, and even a not so smart mathematician can guess that s=4 and t=4

But my HP35S, after inputing the data the usual way, states: NO SOLUTION.

Till yesterday it was working correctly, so I don't know where is the problem. Batteries are ok, changed in October last year, so just 3 months ago.

For your info, during these days I made lot of calculations involving vectors.

This calculator is really an inexhaustible source of surprises...