(a) Let x represent the number of transistors that can be made, y the number of resistors, and z the number of computer chips. Write a system of three linear equations when the amounts of available materials are 810 units of copper, 420 units of zinc, and 480 units of glass. Choose the correct answer below. A. 3x+3y + 2z= 810 x+2y+z=420 2x+y + 2z = 480 OC. x+3y + 2z = 480 3x + 3y +2z = 420 x+2y+z=810 The company can make transistors, resistors, and OB. x+y+z= 420 2x+y+z=810 2x+y + 2z=480 OD. 3x+3y + 2z = 420 x+2y+z=810 2x+y + 2z = 480 computer chips.

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