A farmer is buying two types of feed: Type X and Type Y. Type X feed costs $x$ dollars per bag, and Type Y feed costs $y$ dollars per bag. The farmer buys a total of $N$ bags of feed and spends a total of $T$ dollars. If $B_X$ represents the number of bags of Type X feed and $B_Y$ represents the number of bags of Type Y feed, which system of equations can be used to determine the number of bags of each type of feed purchased?