Solve the system. what restriction, if any, must be placed on the constants to make sure that there is a unique solution to the system? ax + y = b bx + y = a

Sasha delivers newspapers to subscribers that live within a 4 block radius of her house. sasha's house is located at point (0, -1). points a, b, c, d, and e represent the houses of some of the subscribers to the newspaper. to which houses does sasha deliver newspapers?