document.write( "Question 822502: a plane can fly 1120 km in 80 min with the wind. Flying against the same wind, the plane travels the same distance in 84 min. Find the speed of the wind and the speed of the plane in still air. \n" ); document.write( "
Algebra.Com's Answer #494887 by TimothyLamb(4379)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "x + y = 1120/80 km/min
\n" ); document.write( "x - y = 1120/84 km/min
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\n" ); document.write( "put the system of linear equations into standard form
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\n" ); document.write( "x + y = 1120/80 km/min * (60 min/hour) = 840 km/hr
\n" ); document.write( "x - y = 1120/84 km/min * (60 min/hour) = 800 km/hr
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\n" ); document.write( "x + y = 840
\n" ); document.write( "x - y = 800
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\n" ); document.write( "copy and paste the above standard form linear equations in to this solver:
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\n" ); document.write( "answer:
\n" ); document.write( "x= airplane speed = 820 km/hr
\n" ); document.write( "y= wind speed = 20 km/hr
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\n" ); document.write( "Solve and graph linear equations:
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\n" ); document.write( "Solve systems of linear equations up to 6-equations 6-variables:
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