Answer:In direct proportionality as one quantity increase,the other quantity also increase.while in inverse proportionality as one quantity increase, the other quantity decrease.
Explanation:
Both involve two quantities.
In direct proportionality if one quantity increase, the other quantity would increase too,also if one quantity decrease,the other quantity would decrease too.in inverse proportionality if one quantity increase, the other quantity would decrease,also if one quantity decrease the other quantity would increase.