An agricultural scientist is monitoring the growth of two different plant species. Plant A is 5 inches when planted and grows an average of 3.5 inches per week. Plant B is 6 inches when planted and grows an average of 1.5 inches per week. Which system of equations can be used to determine the number of weeks it takes for both plants to be the same height? Let x represent the number of weeks and y represent the height, in inches.