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You cannot solve one linear equation in two unknown variables (x and y), although some non-linear equations will suffice. You need two independent linear equations. All you can do is express one of the variables in terms of the other, but that is not solving the equation.
Eliminate them from the equation. Note: This must be accomplished through the use of legitimate algebraic operations. Erasure is not permitted.
Not sure that you can slove anything. -2w = r + s is one linear equation in 3 unknown variables. You need three independent equations in 3 variables to be able to solve them.
By elimination or substitution
They are called equivalent systems.