document.write( "Question 1146712: Tim buys a new computer for $1200. After four years, he sells the computer to a friend for $450. Let y represent the current value of the computer, and x represent the number of years. Write a linear equation in slope-intercept form to model the value of the computer over time. \n" ); document.write( "
Algebra.Com's Answer #768098 by ankor@dixie-net.com(22740)\"\" \"About 
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Tim buys a new computer for $1200.
\n" ); document.write( " After four years, he sells the computer to a friend for $450.
\n" ); document.write( " Let y represent the current value of the computer, and x represent the number of years.
\n" ); document.write( "Write a linear equation in slope-intercept form to model the value of the computer over time.
\n" ); document.write( ":
\n" ); document.write( "y = mx + b
\n" ); document.write( "y = 1200, when x (time) is 0, therefore b = 1200
\n" ); document.write( "when x=4, y=450, find m
\n" ); document.write( "4m + 1200 = 450
\n" ); document.write( "4m = 450 - 1200
\n" ); document.write( "m = -750/4
\n" ); document.write( "m = -187.5
\n" ); document.write( "the equation
\n" ); document.write( "y = -187.5x + 1200\r
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