document.write( "Question 74141: Solving equations using more than one property. 3(r+4)=21, 3(r-4)=27 \n" ); document.write( "

Algebra.Com's Answer #53137 by funmath(2933) $\"\"$ $\"About$

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Solving equations using more than one property. 3(r+4)=21, 3(r-4)=27
\n" ); document.write( " $\"3%28r%2B4%29=21\"$
\n" ); document.write( " $\"3%28r%29%2B3%284%29=21\"$
\n" ); document.write( " $\"3r%2B12=21\"$
\n" ); document.write( " $\"3r%2B12-12=21-12\"$
\n" ); document.write( " $\"3r=9\"$
\n" ); document.write( " $\"3r%2F3=9%2F3\"$
\n" ); document.write( " $\"highlight%28r=3%29\"$
\n" ); document.write( "To check, let r=3 and see if both sides equal:
\n" ); document.write( " $\"3%283%2B4%29=21\"$
\n" ); document.write( " $\"3%287%29=21\"$
\n" ); document.write( " $\"21=21\"$ We're right!!!!
\n" ); document.write( ":
\n" ); document.write( " $\"3%28r-4%29=27\"$
\n" ); document.write( " $\"3%28r%29%2B3%28-4%29=27\"$
\n" ); document.write( " $\"3r-12=27\"$
\n" ); document.write( " $\"3r-12%2B12=27%2B12\"$
\n" ); document.write( " $\"3r=39\"$
\n" ); document.write( " $\"3r%2F3=39%2F3\"$
\n" ); document.write( " $\"highlight%28r=13%29\"$
\n" ); document.write( "To check, let r=13 and see if both sides equal:
\n" ); document.write( " $\"3%2813-4%29=27\"$
\n" ); document.write( " $\"3%289%29=27\"$
\n" ); document.write( " $\"27=27\"$ We're right again!!!!
\n" ); document.write( "Happy Calculating!!!! \n" ); document.write( "

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