Add the two equations and get 4x = 12 so x = 3 and y = -1
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Without the inclusion of an equality sign the expression can not be considered to be an equation.
there are none, ordered pairs come from equations like x = 2y -5
Since the second one is a multiple of the first, it is automatically the LCM.
Factor out a 2; so it is 2(x+2y).