Rewrite the system of inequalities, adding slack variables or What is the corresponding system of equations? subtracting surplus variables as necessary. X, + X2 + X3 S, =61 X1 + X2 +Xg = 61 X1 + X2 + XB 5- = 30 Xy + Xz + Xg = 30 X1 + X2 Sa = 40 Xq + X, = 40 Type + if the variable is to be added or - if it must be subtracted.)