When Caleb moved into a new house, he planted two trees in his backyard. At the time of planting, Tree A was 37 inches tall and Tree B was 16 inches tall. Each year thereafter, Tree A grew by 4 inches per year and Tree B grew by 7 inches per year. Let AA represent the height of Tree A tt years after being planted and let BB represent the height of Tree B tt years after being planted. Write an equation for each situation, in terms of t, t, and determine the height of both trees at the time when they have an equal height.