document.write( "Question 169622: Solve each system by substitution. Determine whether the equations are independent, dependent or inconsistent:\r
\n" ); document.write( "\n" ); document.write( "y= -4x-7\r
\n" ); document.write( "\n" ); document.write( "y= 3x \n" ); document.write( "
Algebra.Com's Answer #125048 by checkley77(12844)\"\" \"About 
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y=3x
\n" ); document.write( "y=-4x-7
\n" ); document.write( "3x=-4x-7
\n" ); document.write( "3x+4x=-7
\n" ); document.write( "7x=-7
\n" ); document.write( "x=-7/7
\n" ); document.write( "x=-1 ans.
\n" ); document.write( "y=-3*-1
\n" ); document.write( "y=-3 ans.
\n" ); document.write( "Proof:
\n" ); document.write( "-3=-4*-1-7
\n" ); document.write( "-3=4-7
\n" ); document.write( "-3=-3\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );