document.write( "Question 825436: A boat can travel 15 km/h against the current. The same boat can travel 26 km/h with the current. Find the rate of the boat in still water and the rate of the current.
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Algebra.Com's Answer #497282 by TimothyLamb(4379)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "x = boat speed
\n" ); document.write( "y = current speed
\n" ); document.write( "---
\n" ); document.write( "x - y = 15
\n" ); document.write( "x + y = 26
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\n" ); document.write( "copy and paste the above linear system in standard form into this matrix-method solver:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php
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\n" ); document.write( "solution:
\n" ); document.write( "x = boat speed = 20.5 kph
\n" ); document.write( "y = current speed = 5.5 kph
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\n" ); document.write( "system matrix
\n" ); document.write( "1 -1
\n" ); document.write( "1 1
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\n" ); document.write( "inverse of system matrix
\n" ); document.write( "0.5 0.5
\n" ); document.write( "-0.5 0.5
\n" ); document.write( "---
\n" ); document.write( "determinant of system matrix = 2
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\n" ); document.write( "Solve and graph linear equations:
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\n" ); document.write( "Solve quadratic equations, quadratic formula:
\n" ); document.write( "https://sooeet.com/math/quadratic-formula-solver.php
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\n" ); document.write( "Solve systems of linear equations up to 4-equations 4-variables:
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