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solve for "Y" instead of "y" (for function graphing)

In order to solve a system of linear equations (or inequalities) in two variables (x & y) graphically, they first need to be solved for y.  But the symbolic solver only works in lowercase variables, and the function graphing app only accepts uppercase variables.  How is this handled efficiently, without having to manually change each variable from lowercase to uppercase before entering into the function graphing app?