Final answer:
To solve for the quantity demanded, we isolate the variable Qd in the given demand equation. The quantity demanded for a pack of cigarettes is 12 units.
Step-by-step explanation:
We can solve the given demand equation for the quantity demanded by isolating the variable Qd. The demand equation is represented by the equation: 16-2P = 2 + 5P, where P represents the price of a pack of cigarettes. We can solve this equation by combining like terms and isolating the variable Qd on one side.
16 - 2P = 2 + 5P
-2P - 5P = 2 - 16
-7P = -14
P = -14/-7
P = 2
Therefore, the price of a pack of cigarettes is 2 units. To find the quantity demanded, we can substitute this value back into the demand equation: Qd = 16 - 2P
Qd = 16 - 2(2)
Qd = 16 - 4
Qd = 12
The quantity demanded for a pack of cigarettes is 12 units.