The answer is an infinite set of points on a straight line. The exact equation of the straight line depends on the symbol thyat should appear between x and 2y which is invisible because of the inadequacies of the browser used by this site.
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Unfortunately, limitations of the browser used by WA means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "equals" etc.
This means that 2y - 3 = 2y + 4 which is not possible.
x = -4 and y = 4
x=4 x=4
x - 2y = 4 Add 2y to both sides: x = 4 + 2y Subtract 4 from both sides: x - 4 = 2y Divide both sides by 2: (x - 4)/2 = y or y = 0.5x - 2
3x + 2y = 4; 2x - 2y = 16 Add; 5x = 20 so x = 4 and y is therefore -4