document.write( "Question 927422: A sailboat takes 4 hours to travel 128 km going upstream. The return trip takes 2 hours going down stream. What is the rate of the boat in still water and what is the rate of the current? \n" ); document.write( "
Algebra.Com's Answer #562970 by TimothyLamb(4379)\"\" \"About 
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x = speed of boat in still water
\n" ); document.write( "y = speed of current
\n" ); document.write( "---
\n" ); document.write( "s = d/t
\n" ); document.write( "---
\n" ); document.write( "upstream:
\n" ); document.write( "x - y = 128/4
\n" ); document.write( "---
\n" ); document.write( "downstream:
\n" ); document.write( "x + y = 128/2
\n" ); document.write( "---
\n" ); document.write( "put the system of linear equations into standard form
\n" ); document.write( "---
\n" ); document.write( "x - y = 32
\n" ); document.write( "x + y = 64
\n" ); document.write( "---
\n" ); document.write( "copy and paste the above standard form linear equations in to this solver:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php
\n" ); document.write( "---
\n" ); document.write( "solution:
\n" ); document.write( "x = speed of boat in still water = 48 kph
\n" ); document.write( "y = speed of current = 16 kph
\n" ); document.write( "---
\n" ); document.write( "Solve and graph linear equations:
\n" ); document.write( "https://sooeet.com/math/linear-equation-solver.php
\n" ); document.write( "---
\n" ); document.write( "Solve quadratic equations, quadratic formula:
\n" ); document.write( "https://sooeet.com/math/quadratic-formula-solver.php
\n" ); document.write( "---
\n" ); document.write( "Solve systems of linear equations up to 6-equations 6-variables:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php \n" ); document.write( "
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