HP 50g can't solve system of equations

[rawi]

Yes, that's true, you get only one solution for [x,y] if you call MSLV once. From the manual p. 3-152 about the MSLV function: "Numerically approximates a solution to a system of equations. Searches for a solution accurate to 12 digits, regardless of the display setting."
So this function always stops if one solution is found and this solution depends on the input you give. If your input is [8.,-5.] you get [8.5029,-5.5029] as a solution. So if you want more than one solution you have to put in different intitial guesses.
This function in the HP 50g was rather new. I have a HP 49g which has basically the same functionality but does not have the MSLV command.