<PRE><B>Question 179975</B>
The equations S = 5000 + 200x and
D = 9500 - 100x express the supply S and the
demand D, respectively, for a popular compact disc brand
in terms of its price x (in dollars).
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a) Graph the equations on the same coordinate system.
{{{graph(400,300,-10,30,-10,20000,5000+200x,9500-100x)}}}
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b) What happens to the supply as the price increases?
supply increases because the slope is positive; it is 200.
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c) What happens to the demand as the price increases?
Demand decreases because the slope is negative; it is -100
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d) The price at which supply and demand are equal is
called the equilibrium price. What is the equilibrium
price? 
5000 + 200x  = 9500 - 100x
300x = 4500
x = $15
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Cheers,
Stan H.</PRE>