Stick to x , y , and z for the fastest recognition, though the engine can handle most alphabetic characters.
If a system is dependent or inconsistent, Wolfram|Alpha will explicitly state that "no solution exists" or provide a general solution in terms of a free variable. Tips for Better Results System Of Equation Solver Wolfram Alpha
It provides solutions in exact radical or fraction form, as well as decimal approximations. Stick to x , y , and z
While usually unnecessary, starting your prompt with the word "solve" ensures the engine treats the input as an equation rather than a mathematical expression to be simplified. Stick to x