Given that x and y are positive integers and (x·2)+x(4)+(y·8)+(y·16)=42, what is the value of xy?

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? )