Demand for a brand of clock radio is given by p+3q=390 , and the supply for these radios is given by p=7q=90 , where is the price and is the quantity demanded at price . solve the system containing these two equations to find the price at which the quantity demanded equals the quantity supplied and the equilibrium quantity.

p=$300 and q=30 clock radio

Step-by-step explanation:

we have

p ----> is the price

q ----> is the quantity

----> equation A

----> equation B

Solve the system of equations by graphing

Remember that the solution is the intersection point both graphs

using a graphing tool

The intersection point is (300,30)

see the attached figure  

therefore

The solution is

p=$300

q=30 clock radio