document.write( "Question 92432: I'd really appreciate your input on this problem.\r
\n" ); document.write( "\n" ); document.write( "Tom and David both collected a total of 480 marbles. Tom stacked each column with 6 marbles. and David stacked each column with 9 marbles. They stacked 72 columns together. Write an equation using this information.\r
\n" ); document.write( "\n" ); document.write( "Well, i came up with 56 columns for Tom; and 16 columns for David which equal 72 together. Tom collected 56columns x 6marbles=336
\n" ); document.write( "David collected 16columns x 9marbles=144
\n" ); document.write( "Tom plus David=480marbles. But, how do i write an equation for these numbers?? \n" ); document.write( "

Algebra.Com's Answer #67300 by scott8148(6628) $\"\"$ $\"About$

You can put this solution on YOUR website!
start by defining variables ... let t=Tom's marbles, let d=David's marbles ... then write equations\r
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\n" ); document.write( "\n" ); document.write( "\"Tom and David both collected a total of 480 marbles\" ... t+d=480\r
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\n" ); document.write( "\n" ); document.write( "\"Tom stacked each column with 6 marbles. and David stacked each column with 9 marbles. They stacked 72 columns together\" ... (t/6)+(d/9)=72\r
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\n" ); document.write( "\n" ); document.write( "this gives you two equations and two unknowns ... the easiest solution method is probably substitution \n" ); document.write( "

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