A textbook store sold a combined total of 432 physics and biology textbooks in a week. The number of physics textbooks sold was two times the number of biology textbooks sold. How many textbooks of each type were sold?

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )