Isolate one of the variable using inverse operations. Then solve.
Example: 2x + 4y = 0 --subtract 4y>> 2x = -4y --divide by -4>> -1/2x = y --plug in your variable -->>
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To start with, it is not an equation - there is no equality sign. You need 2 independent equations to solve when you have two unknowns, x and y.
It is not possible to solve a linear equation in two unknowns without knowing one of them.
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You cannot solve one equation in two unknowns.
They are a set of equations in two unknowns such that any term containing can contain at most one of the unknowns to the power 1. A system of linear equations can have no solutions, one solution or an infinite number of solutions.