The edges on Erik's snowboard are chipped and dented from riding over rocks, so Erik wants to buy a new one. He can't afford the board he wants, so he opens a hot chocolate stand near his house. Erik figures out how many cups of hot chocolate he must sell to have enough money for the snowboard. One cold, snowy Saturday, Erik sells 43 cups of hot chocolate. Now, he needs to sell 47 more cups to buy the snowboard.
Which equation can you use to find the total number of cups c Erik must sell to buy the snowboard?