document.write( "Question 503478: One number is seven times another. If their difference is 18, what are the numbers? \n" ); document.write( "

Algebra.Com's Answer #339246 by oberobic(2304) $\"\"$ $\"About$

You can put this solution on YOUR website!
x = one number
\n" ); document.write( "y = another
\n" ); document.write( "x = 7y
\n" ); document.write( "x-y =18
\n" ); document.write( ".
\n" ); document.write( "substitute x=7y
\n" ); document.write( "7y-y = 18
\n" ); document.write( "6y = 18
\n" ); document.write( "y = 3
\n" ); document.write( ".
\n" ); document.write( "substitute y=3
\n" ); document.write( "x = 7y
\n" ); document.write( "x = 7(3)
\n" ); document.write( "x = 21
\n" ); document.write( ".
\n" ); document.write( "Always check your answer.
\n" ); document.write( "Is the difference = 18?
\n" ); document.write( "21 -3 = 18.
\n" ); document.write( "Correct.
\n" ); document.write( "And of course, we know 21 = 3*7
\n" ); document.write( ".
\n" ); document.write( "The two numbers are 3 and 21.
\n" ); document.write( ".
\n" ); document.write( "Done \n" ); document.write( "

\n" );