The local animal shelter throws a dog-themed party. humans, h, and dogs, d are both invited. the event space imposes two restrictions on the party: there can only be 120 dogs and humans combined, and, to keep things manageable, there must be 1 human to every 3 dogs. this situation can be represented by a system of two linear equations. one of these equations is given. write the second equation in the box. d/3=h