Aproportional relationship is a linear relationship because the rate of change is constant and equal to the constant proportionality what is required of a proportional relationship that is not required of a general linear relationship

Hassan bought a package of tofu. the temperature of the tofu was 14° celsius when hassan put the package into the freezer. he left the tofu in the freezer until it reached –19° celsius. which expressions explain how to find the change in temperature, in degrees celsius, of the package of tofu? select three that apply.