(ax + by)(cx – dy) In the expression above, a, b, c, and d are non-zero constants and ad = bc. If ac = 18 and bd = 50, what is the value of the coefficient of the xy term when %3D the expression is multiplied out and the like terms are collected?

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A: The given system of equations,x1+2x2-x3=22x1+3x2+x3=113x1-x2+4x3=13

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