Question about solve function for system of non linear equations

[Rich]

Oh sure, no problem,

fsolve([1=a*b 1=a*(-b^2+1)^.5], [a b])

Where [] indicates a matrix with separated elements by pressing , (comma), so the commas are not shown in my equation above. Image attached.

   

I want to setup user keys, but i really wish it was available to assign to "soft menu" keys like in the 50g, otherwise i might forget what key is what. This is probably one of my top request to have in the Prime, that an undo key, and maybe a better way to store equations.