An increase in demand would cause the demand curve to move to the right as a result. The equilibrium quantity would increase, and the equilibrium interest rate would also increase. On the other hand, a decrease in demand would cause the demand curve to move to the left, thus causing the equilibrium quantity and equilibrium interest rate to decrease.
An increase in supply would cause a rightward shift in the supply curve, increasing the equilibrium quantity and decreasing the equilibrium interest rate. A decrease in supply would cause a leftward shift in the supply curve, decreasing the equilibrium quantity and increasing the equilibrium interest rate.