document.write( "Question 201826: Solve by Substitution,
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\n" ); document.write( "7x-8y=-1
\n" ); document.write( "6x+36=y
\n" ); document.write( "7x-8(6x+36)=-1
\n" ); document.write( "7x-48x-288= -1
\n" ); document.write( "41x=287
\n" ); document.write( "x=-7
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\n" ); document.write( "y=???? How??\r
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Algebra.Com's Answer #152062 by RAY100(1637)\"\" \"About 
You can put this solution on YOUR website!
Very good work,,,,,(+41 should be -41)
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\n" ); document.write( "with x=-7,,,substitute back into 1st eqn
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\n" ); document.write( "7(-7) -8y = -1
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\n" ); document.write( "-49 -8y = -1
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\n" ); document.write( "-8y = -1 +49 = =48
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\n" ); document.write( "y = -6
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\n" ); document.write( "(-7,-6) is answer
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\n" ); document.write( "check,,,(1) 7(-7) -8(-6) = -1,,,-49 +48 =-1,,,,ok
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\n" ); document.write( "(2) 6(-7) +36 = -6,,,,-42 + 36 = -6,,,,,ok
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\n" ); document.write( "Good work,,,Keep it going
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