5. A store has a special sale on bundles of pen and pencil boxes. The total cost onou boxes of pens and five boxes of pencils is $40. The total cost of four boxes of pens and two boxES of pencils is $28. Let x represent the cost of one box of pens. Let y represent the cost of one box of pencils. Which system of equations best represents the situation? 5x + 4y = 40 %3D (a) 4y 28

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