document.write( "Question 154428: cindy charges $6.60 for 5 cartons of fries and 2 sodas and $3.82 for 3 cartons of fries and 1 soda determine the cost of one soda and one carton fries. \n" ); document.write( "
Algebra.Com's Answer #113727 by orca(409)\"\" \"About 
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Let x be the unit price of fries.
\n" ); document.write( "Let y be the unit price of soda.
\n" ); document.write( "As 5 cartons of fries and 2 sodas is sold for $6.60, we have
\n" ); document.write( "5x + 2y = 6.6 ...........(1)
\n" ); document.write( "As 3 cartons of fries and 1 sodas is sold for $3.82, we have
\n" ); document.write( "3x + y = 3.82 ...........(2)
\n" ); document.write( "Next solve simultaneous equations (1) and (2) for x and y.
\n" ); document.write( "Multiplying equation (2) by 2, we have
\n" ); document.write( "6x + 2y = 7.64 ..........(3)
\n" ); document.write( "Subtracting equation (1) from (3), we have
\n" ); document.write( "x = 1.04
\n" ); document.write( "From equation (2), we have
\n" ); document.write( "y = 3.82 - 3x
\n" ); document.write( "Substituting x = 1.04 into it, we obtain
\n" ); document.write( "y = 3.82 - 3*1.04 = 0.7
\n" ); document.write( "So
\n" ); document.write( "the unit price of fries is $1.04.
\n" ); document.write( "the unit price of soda is $0.7\r
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