document.write( "Question 61694This question is from textbook Alegbra Concepts and applications
\n" ); document.write( ": please help\r
\n" ); document.write( "\n" ); document.write( "Use substitution to solve for x and y\r
\n" ); document.write( "\n" ); document.write( "3x - y = 3\r
\n" ); document.write( "\n" ); document.write( "y = 2x - 1 \n" ); document.write( "
Algebra.Com's Answer #42493 by funmath(2933)\"\" \"About 
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Use substitution to solve for x and y\r
\n" ); document.write( "\n" ); document.write( "E1: 3x - y = 3\r
\n" ); document.write( "\n" ); document.write( "E2: y = 2x - 1
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\n" ); document.write( "Substitute 2x-1 from E2 in for y in E1 and solve for x.
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\n" ); document.write( "3x-(2x-1)=3
\n" ); document.write( "3x-2x+1=3
\n" ); document.write( "x+1=3
\n" ); document.write( "x+1-1=3-1
\n" ); document.write( "x=2
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\n" ); document.write( "Substitute 2 in for x in E2 and solve for y.
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\n" ); document.write( "y=2(2)-1
\n" ); document.write( "y=4-1
\n" ); document.write( "y=3
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\n" ); document.write( "Therefore the solution is (x,y)=(2,3)
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\n" ); document.write( "Sanity Check, does that solution work for both E1 and E2.
\n" ); document.write( "3(2)-(3)=3--->6-3=3--->3=3 E1 Checks
\n" ); document.write( "3=2(2)-1--->3=4-1--->3=3 E2 Checks
\n" ); document.write( "Happy Calculating!!! \n" ); document.write( "
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