00:01
All right, they give you two equations.
00:03
The first equation they give you is a demand function and it tells you that's p squared plus four q equals 1800.
00:14
And then they give you a supply function and they define the supply function as 700 minus p squared plus 16 q equals zero.
00:26
All right, then they give explicit directions to solve the supply equation for p squared.
00:32
So i'm just gonna add p squared to each side.
00:35
So that'll become 700 plus 16 q that equals p squared.
00:44
Then it says substitute this value for p squared in the demand equation.
00:50
All right, so p squared is now 700 plus 16 q plus four q equals 1800 and it tells you to solve for q.
01:03
So if i subtract 700 from each side, i get 1100 and 16 q plus four q is 20 q.
01:11
So i'll have to divide each side by 20.
01:14
So q is 55.
01:17
And i am assuming this is the equilibrium quantity...