document.write( "Question 258842: a + b = 10
\n" ); document.write( "3a + 2b = 40\r
\n" ); document.write( "\n" ); document.write( "To solve the above system of equations using the substitution method you could substitute which of the following into the second equation?
\n" ); document.write( " b=10+a
\n" ); document.write( " a = 10 + b
\n" ); document.write( " a = 10 - b
\n" ); document.write( " 2b = 10 - a
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Algebra.Com's Answer #190556 by Fombitz(32388)\"\" \"About 
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Use eq. 1,
\n" ); document.write( "\"a%2Bb=10\"
\n" ); document.write( "\"a=10-b\"
\n" ); document.write( "Substitute that into the second eq. for a and solve for b.
\n" ); document.write( "\"a=10-b\"
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