How do you get P=12.4-4Qd to equal P=-2.6+2Qs? You have to find the equalibrium so you have to set Qd=Qs so I can't figure out how to get p in the equations and the equations to equal Qd & Qs.

At equilibrium, Pd (price demand) = Ps (price supply), and that Qd=Qs. So,

12.4-4Q=-2.6+2Q. Solve for Q:
15.0-4Q= 2Q
15.0 = 6Q
(15/6) = Q

2.5

To set Qd (quantity demanded) equal to Qs (quantity supplied) and solve for the equilibrium price (P), you need to equate the two equations P = 12.4 - 4Qd and P = -2.6 + 2Qs.

First, set Qd equal to Qs:
12.4 - 4Qd = -2.6 + 2Qs

Next, isolate Qd terms on one side and Qs terms on the other side of the equation:
4Qd + 2Qs = 12.4 + 2.6

Combine the constants:
4Qd + 2Qs = 15

Now, you have an equation with two variables (Qd and Qs), which means you need additional information to find their specific values. This equation alone does not allow you to determine the equilibrium price.

To find the equilibrium price, you would generally use the supply and demand curves or tables. These curves or tables provide information regarding the relationship between quantity and price for both demand and supply.

If you have the demand and supply functions, or data points, you could substitute any value for Qd or Qs and find the corresponding P. The equilibrium price (P) is the value where the quantity demanded equals the quantity supplied.

Without further information, it is not possible to find the exact value of P or determine the equilibrium price.