document.write( "Question 885604: Directions: Solve each system of equations by the substitution method.\r
\n" ); document.write( "\n" ); document.write( "Problem: x+2y=6 & 2x+3y=8\r
\n" ); document.write( "\n" ); document.write( "Everytime I think I have it, im lost for the next problem, help!
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Algebra.Com's Answer #535291 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
\"Everytime I think I have it, im lost for the next problem, help!\"\r
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\n" ); document.write( "\n" ); document.write( "If that is the case, then try generalizing completely for two linear equations in standard form.\r
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\n" ); document.write( "\n" ); document.write( "\"ax%2Bby=c\" & \"dx%2Bey=k\".
\n" ); document.write( "You wish to use the substitution method.\r
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\n" ); document.write( "\n" ); document.write( "Solve either equation for one of the variables.
\n" ); document.write( "Arbitrarily, x from the first equation:
\n" ); document.write( "\"ax=c-by\"
\n" ); document.write( "\"x=%28c-by%29%2Fa\"
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\n" ); document.write( "Substitute for x in the second equation:
\n" ); document.write( "\"d%28c-by%29%2Fa%2Bey=k\"
\n" ); document.write( "Solve this for y.
\n" ); document.write( "\"d%28c-by%29%2Baey=ak\"
\n" ); document.write( "\"dc-bdy%2Baey=ak\"
\n" ); document.write( "\"-bdy%2Baey=ak-dc\"
\n" ); document.write( "\"y%28ae-bd%29=ak-dc\"
\n" ); document.write( "\"highlight%28y=%28ak-dc%29%2F%28ae-bd%29%29\"-----See that this solution for y uses only an expression of constants, so this will be evaluable when we know the values of those constants.
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\n" ); document.write( "Again use the previous formula for x, substitute the found formula solution for y, and simplify:
\n" ); document.write( "\"x=%28c-by%29%2Fa\"
\n" ); document.write( "\"x=%28c-b%28%28ak-dc%29%2F%28ae-bd%29%29%29%2Fa\"
\n" ); document.write( "\"x=%28c%28ae-bd%29-b%28ak-dc%29%29%2F%28a%28ae-bd%29%29\"
\n" ); document.write( "\"x=%28ace-bcd-abk%2Bbcd%29%2F%28a%5E2e-abd%29\"
\n" ); document.write( "\"highlight%28x=%28ace-abk%29%2F%28a%5E2e-abd%29%29\"-----again the right-member is an expression of constants.
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