This relationship between two variables involves them having a positive slope. This means that as volume increases, temperature also increases which isn't the case.
This cause and effect pattern also means that the volume doesn't have explanatory variables.
Imagine what x is quantity of stools. So 3x+120=4x x=120 120 stools in cafeteria 120 chairs in cafeteria 120+120=240 There 240 people can sit in this cafeteria