Reference - HP 50g User Manual

In ALG mode, press @ECHO to copy the example to the stack, press ` to
run the example. To see all the elements in the solution you need to
activate the line editor by pressing the down arrow key (˜):
In RPN mode, the solution for this example is produced by using:
Activating function MSLV results in the following screen.
You may have noticed that, while producing the solution, the screen shows
intermediate information on the upper left corner. Since the solution
provided by MSLV is numerical, the information in the upper left corner
shows the results of the iterative process used to obtain a solution. The
final solution is X = 1.8238, Y = -0.9681.

Reference

Additional information on solving single and multiple equations is provided
in Chapters 6 and 7 of the calculator's user's guide.
Page 6-11