At a price of

$2.23

per bushel, the supply of a certain grain is

7100

million bushels and the demand is

7900

million bushels. At a price of

$2.3

per bushel, the supply is

7500

million bushels and the demand is

7800

million bushels.(A) Find a price-supply equation of the form

p=mx+b,

where p is the price in dollars and x is the supply in millions of bushels.(B) Find a price-demand equation of the form

p=mx+b,

where p is the price in dollars and x is the demand in millions of bushels.(C) Find the equilibrium point.(D) Graph the price-supply equation, price-demand equation, and equilibrium point in the same coordinate system.