document.write( "Question 287: To produce 80 copies of a magazine costs 52 cents per copy.
\n" ); document.write( "To produce 760 copies of the magazine costs 35 cents per copy.
\n" ); document.write( "a) Name two ordered pairs.
\n" ); document.write( "b) Write the linear equation.
\n" ); document.write( "c) Predict the cost per copy for 480 copies. \n" ); document.write( "
Algebra.Com's Answer #135 by AnlytcPhil(1807)\"\" \"About 
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To produce 80 copies of a magazine costs 52 cents per copy. To produce 760\r\n" );
document.write( "copies of the magazine costs 35 cents per copy.\r\n" );
document.write( "a) Name two ordered pairs.\r\n" );
document.write( "(80,52) and (760,35)\r\n" );
document.write( "b) Write the linear equation.

\n" ); document.write( "`
\n" ); document.write( "Use the slope formula:
\n" ); document.write( "` ` `y2 - y1
\n" ); document.write( "m = ---------
\n" ); document.write( "` ` `x2 - x1
\n" ); document.write( "`
\n" ); document.write( "with (x1,y1) = (80,52) and (x2,y2) = (760,35)
\n" ); document.write( "`
\n" ); document.write( "` ` ` 35 - 52 -17 -1
\n" ); document.write( "m = --------- = --- = --- = -0.025
\n" ); document.write( "` ` `760 - 80 680 40
\n" ); document.write( "`
\n" ); document.write( "Now use the point-slope formula:
\n" ); document.write( "y - y1 = m(x - x1)
\n" ); document.write( "y - 52 = -0.025(x - 80)
\n" ); document.write( "y - 52 = -0.025x + 2
\n" ); document.write( "` ` `y = -0.025x + 54
\n" ); document.write( "`
\n" ); document.write( "c) Predict the cost per copy for 480 copies.
\n" ); document.write( "Substitute 480 for x in that equation
\n" ); document.write( "` ` `y = -0.025(480) + 54
\n" ); document.write( "` ` `y = 42
\n" ); document.write( "`
\n" ); document.write( "Edwin J
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