document.write( "Question 544408: what is y=x+4 if y=-x \n" ); document.write( "
Algebra.Com's Answer #355099 by Maths68(1474)\"\" \"About 
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y=x+4 if y=-x
\n" ); document.write( "Put y = -x
\n" ); document.write( "-x=x+4
\n" ); document.write( "-x-x=4
\n" ); document.write( "-2x=4
\n" ); document.write( "Divide by -2 both sides
\n" ); document.write( "-2x/-2=4/-2
\n" ); document.write( "x=-2
\n" ); document.write( "
\n" );