50g

I have brought up the numeric solver, (rt shift + 7), and selected the
solve equation option.

The following displays:
eq: 'V=I*R'
v:
I:
R:

I can enter the variables and solve this equation just fine.  If I use
choose, I get a long list of memory contents.  If I edit the 1st line
it shows 4 ohms law formulas-

{ 'V=I*R' 'P=V*I' 'P=I^2.*R' 'P=V^2./R' }

I see this as a list of equations for ohms law and the first on in the
list is the one that comes up when starting.  My question is how do I
change to the second or third formula in the list or is it possible to
do so.  I bought the 50g used and it's possible that the previous user
entered this equation.

I tried reading about this in the advanced user guide but it only
covered inputting a new equation and did not cover having a list.  Any
help would be appreciated.

Thanks,
Ron