An increase in quantity and an indeterminate change in price are consistent with a: Multiple Choice a. leftward shift in demand and supply b. rightward shift in supply and demand. c. rightward shift in supply, keeping demand constant. d. rightward shift in demand, keeping supply constant.

b. rightward shift in supply and demand

Explanation:

A rightward shift in the supply curve means an increase in supply. All things being equal, this leads to an increase in Quanitity supplied and a fall in price. Also, a rightward shift in the demand curve me and an increase in Quanitity demanded and an increase in price. Taking these two effects together, equilibrium quantity rises but there's an indeterminate effect on price.

Please check the attached image for a graph of this explanation.

I hope my answer helps you

u = 30

continuing your method

= +

subtract from both sides

= - thus

= -

= ⇒ u = 30