Janice has a coin collection that began with 26 coins. Since then, she has been adding to her collection at a rate of 5 coins every 3 months. Part A Write an equation that relates the number of coins, y, in Janice's collection x months since she started adding to her collection. ​ ​ ​Part B ​ ​In the context of this problem, interpret and explain the y-intercept and slope of the graph of the equation.