document.write( "Question 84143: Solve the system by substitution \r
\n" ); document.write( "\n" ); document.write( "5x+2y=-15
\n" ); document.write( " y=2x-12
\n" ); document.write( "

Algebra.Com's Answer #60593 by funmath(2933)\"\" \"About 
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Solve the system by substitution \r
\n" ); document.write( "\n" ); document.write( "5x+2y=-15 R1
\n" ); document.write( " y=2x-12 R2
\n" ); document.write( "Let y=(2x-12) in R1 and solve for x
\n" ); document.write( "5x+2(2x-12)=-15
\n" ); document.write( "5x+4x-24=-15
\n" ); document.write( "9x-24=-15
\n" ); document.write( "9x-24+24=-15+24
\n" ); document.write( "9x=9
\n" ); document.write( "9x/9=9/9
\n" ); document.write( "x=1
\n" ); document.write( "Let x=1 in R2 and solve for y
\n" ); document.write( "y=2(1)-12
\n" ); document.write( "y=2-12
\n" ); document.write( "y=-10
\n" ); document.write( "The solution to the system is (x,y)=(1,-10)
\n" ); document.write( "Happy Calculating!!!!
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