The table shows two ways that a company can spend a certain amount of money for boxes of small envelopes and large envelopes. Number of Boxes of Small Envelopes 0, 30 and number of Boxes of Large Envelopes 50, 30 Which of the following equations gives all possible numbers of boxes of small envelopes, x, and boxes of large envelopes, y, that the company can buy? A x + y = 50 B x + y = 150 c2x + 3y = 50 D2x + 3y = 150