A neighborhood planner uses a coordinate plane to design a new neighborhood. The coordinates A(1,−1)​ , B(1,−2)​ , and C(2,−1)​ represent House A, House B, and House C. The planner decides to place a playground centered at the origin, and moves the houses to make space. House A is now located at A′(3,−4)​ . What are the new coordinates of House B and House C when each house is moved using the same translation?