document.write( "Question 59945: A rental car costs $25 plus afixed charge per mile driven. The total chrge for 210 miles of use was $89. Write an equation for the cost,C(in dollars), in terms of the mile driven x. \n" ); document.write( "
Algebra.Com's Answer #41176 by tutorcecilia(2152)\"\" \"About 
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y=mx+b [Use the slope-intercept format for the equation of this line since the y-intercept is given (25) and you can find the slope from the information given:
\n" ); document.write( "$25=the flat-fee (y-intercept)
\n" ); document.write( "210miles=one of the values of (x) miles
\n" ); document.write( "$89=one of the values for the total (y) when x=210
\n" ); document.write( ".
\n" ); document.write( "C(x)=mx+b
\n" ); document.write( "C(210)=m(210)+25 [Plug-in the given values and solve for m]
\n" ); document.write( "89=m(210)+25 [Solve for the slope (m)]
\n" ); document.write( "89-25=210m+25-25
\n" ); document.write( "64=210m
\n" ); document.write( "64/210=m
\n" ); document.write( "32/105=m
\n" ); document.write( ".
\n" ); document.write( "C(x)=(32/105)x+25 [Plug-in the value of the slope and the y-intercept for the equation of the line. \n" ); document.write( "
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