document.write( "Question 1008242: Solve by using a system of equations.\r \n" );
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document.write( "The number x of smartphones a manufacturer is willing to sell is given by \n" );
document.write( "x = 21p − 1600,where p is the price, in dollars, per smartphone. The number x of smartphones a wholesale distributor is willing to purchase is given by \n" );
document.write( "x = −4p + 900,where p is the price per smartphone. Find the equilibrium price.\r \n" );
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document.write( "=$ \n" );
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