document.write( "Question 125385This question is from textbook Intermediate Algebra Review
\n" ); document.write( ": The demand for a certain toy is such that no one will purchase it once the price reaches $7. For every $0.02 decreases in price, 1 unit more will be sold. Write the price as a function of the number of units sold.
\n" ); document.write( "How many toys would you expect to be sold if the price were set at $4.79? \n" ); document.write( "
Algebra.Com's Answer #91988 by ankor@dixie-net.com(22740)\"\" \"About 
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The demand for a certain toy is such that no one will purchase it once the price reaches $7. For every $0.02 decreases in price, 1 unit more will be sold. Write the price as a function of the number of units sold.
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\n" ); document.write( "We need two sets of coordinates to find an equation x = price; y = no. sold
\n" ); document.write( "This first set is given x = 7; y = 0
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\n" ); document.write( "Choose the 2nd set of coordinates, x = 6; y = 50, from the statement:
\n" ); document.write( "\"For every $0.02 decreases in price, 1 unit more will be sold.
\n" ); document.write( ":
\n" ); document.write( "Find the slope m = \"%2850+-+0%29%2F%286+-+7%29\" = \"50%2F%28-1%29\" = -50
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\n" ); document.write( "Find the equation using the point/slope formula: y - y1 = m(x - x1)
\n" ); document.write( "x1 = 7; y1 = 0; m = -50
\n" ); document.write( "y - 0 = -50(x - 7)
\n" ); document.write( "y = -50x + 350
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\n" ); document.write( "f(x) = -50x + 350 would be the equation:
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\n" ); document.write( ":
\n" ); document.write( "How many toys would you expect to be sold if the price were set at $4.79?
\n" ); document.write( "Substitute 4.79 for x
\n" ); document.write( "f(4.79) = -50(4.79) + 350
\n" ); document.write( "f(4.79) = -239.5 + 350
\n" ); document.write( "f(4.79) = 110.5 ~ 110 toys sold at $4.79 \n" ); document.write( "
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