Assume we have the following a system of linear equation.  x1 - 2x2 = 3 3x1 - 4x2 = 7 Then the exact solution is xTS = (1,−1). Let an approximate solution xNS =(−1,−1). Then, fill the following blank by rounding in four decimal places.   relative residual (= relative backward error) =  relative error (= relative forward error) =  error magnification factor =  The condition number =

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