Suppose $Q _ { D } = - 5 P + 44$ and $Q _ { s } = P - 4$ .The equilibrium quantity is
A)2
B)3
C)4
D)5

Question

Quizplus · Accepted Answer

The equilibrium quantity is where quantity demanded equals quantity supplied. 
So, we can set Qd = Qs and solve for P to find the equilibrium price. 
Qd = Qs:
-5P + 44 = P - 4 
Solving for P: 
6P = 48 
P = 8 
Now we substitute this value for P in either Qd or Qs to find the equilibrium quantity: 
Q = P - 4 = 8 - 4 = 4. 
Therefore, the equilibrium quantity is 4.

Suppose QD=−5P+44Q _ { D } = - 5 P + 44QD​=−5P+44

Suppose $Q _ { D } = - 5 P + 44$