The demand function of a good is given by $q_d(p)=12-p$, $(p\geq 0)$ and the supply function by $q_s(p)=3p$, $(p\geq 0)$. Determine the market equilibrium.
$(q,p)=(9,3)$
$(q,p)=(3,9)$
None of the other answers are correct.
$(q,p)=(6,6)$
The demand function of a good is given by $q_d(p)=12-p$, $(p\geq 0)$ and the supply function by $q_s(p)=3p$, $(p\geq 0)$. Determine the market equilibrium.
Antwoord 1 correct
Correct
Antwoord 2 optie
$(q,p)=(3,9)$
Antwoord 2 correct
Fout
Antwoord 3 optie
None of the other answers are correct.
Antwoord 3 correct
Fout
Antwoord 4 optie
$(q,p)=(6,6)$
Antwoord 4 correct
Fout
Antwoord 1 optie
$(q,p)=(9,3)$
Antwoord 1 feedback
Correct:

$$\begin{align*}
q_d(p)=q_s(p)& \Leftrightarrow 12-p=3p\\
& \Leftrightarrow 12=4p\\
& \Leftrightarrow p=3.
\end{align*}$$

Hence, the market equilibrium is $(q,p)=(9,3)$.

Go on.
Antwoord 2 feedback
Wrong: What is $p$?

Try again.
Antwoord 3 feedback
Wrong: The correct answer is among them.

Try again.
Antwoord 4 feedback
Wrong: $12-p=3p \Leftrightarrow 12=2p$ is not correct.

See Linear functions: Example 2.