document.write( "Question 68636This question is from textbook
\n" ); document.write( ": x=-3
\n" ); document.write( "y=2x + 1 \n" ); document.write( "
Algebra.Com's Answer #48938 by tutorcecilia(2152)\"\" \"About 
You can put this solution on YOUR website!
x=-3
\n" ); document.write( "y=2x + 1
\n" ); document.write( ".
\n" ); document.write( "Substitute x=-3 into the second equation and solve for y
\n" ); document.write( "y=2(-3)+1
\n" ); document.write( "y=-6+1
\n" ); document.write( "y=-5
\n" ); document.write( ".
\n" ); document.write( "Plug y=-5 back into the second equation and solve for x:
\n" ); document.write( "-5=2x+1
\n" ); document.write( "-5-1=2x+1-1
\n" ); document.write( "-6=2x
\n" ); document.write( "-3=x [checks out]
\n" ); document.write( "or
\n" ); document.write( "y=2x+1
\n" ); document.write( "(-5)=2(-3)+1
\n" ); document.write( "-5=-6+1
\n" ); document.write( "-5=-5 [also checks out]\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );