document.write( "Question 791172: y= 4X
\n" ); document.write( "X+Y=5
\n" ); document.write( "How do I solve this equation? \n" ); document.write( "
Algebra.Com's Answer #479416 by rothauserc(4718)\"\" \"About 
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y= 4X
\n" ); document.write( "X+Y=5
\n" ); document.write( "substitute for y in the second equation
\n" ); document.write( "x +4x = 5
\n" ); document.write( "5x = 5
\n" ); document.write( "x = 1
\n" ); document.write( "y = 4*1
\n" ); document.write( "y = 4
\n" ); document.write( "solution is x = 1, y = 4
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