document.write( "Question 249994: Solve each system by substitution. Check your solution.\r
\n" ); document.write( "\n" ); document.write( "19.
\n" ); document.write( "a-1.2b=-3
\n" ); document.write( "0.2b+0.6a=12
\n" ); document.write( "

Algebra.Com's Answer #181980 by checkley77(12844)\"\" \"About 
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a-1.2b=-3 or a=1.2b-3
\n" ); document.write( "0.2b+0.6a=12
\n" ); document.write( ".2b+.6(1.2b-3)=12
\n" ); document.write( ".2b+.72b-1.8=12
\n" ); document.write( ".92b=12+1.8
\n" ); document.write( ".92b=13.8
\n" ); document.write( "b=13.8/.92
\n" ); document.write( "b=15 ans.
\n" ); document.write( "a=1.2*15-3
\n" ); document.write( "a=18-3
\n" ); document.write( "a=15 ans.
\n" ); document.write( "Proof:
\n" ); document.write( ".2*15+.6*15=12
\n" ); document.write( "3+9=12
\n" ); document.write( "12=12
\n" ); document.write( "
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