document.write( "Question 884197: Please help me with this problem, \"If I collect $1 and $2 coins until I have 275 coins and I have a total of $402 how many $2 coins do I have?\" I don't understand what they are asking me to do. \n" ); document.write( "
Algebra.Com's Answer #534065 by nerdybill(7384)\"\" \"About 
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\"If I collect $1 and $2 coins until I have 275 coins and I have a total of $402 how many $2 coins do I have?\"
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\n" ); document.write( "Let x = number of $1 coins
\n" ); document.write( "and y = number of $2 coins
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\n" ); document.write( "From:\"collect $1 and $2 coins until I have 275 coins\" we get:
\n" ); document.write( "x + y = 275
\n" ); document.write( "From:\"I have a total of $402\" we get:
\n" ); document.write( "x + 2y = 402
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\n" ); document.write( "Simultaneous equations:
\n" ); document.write( "x + y = 275
\n" ); document.write( "x + 2y = 402
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\n" ); document.write( "multiply top equaion by -1 and ADD to bottom equation:
\n" ); document.write( "-x - y = -275
\n" ); document.write( " x + 2y = 402
\n" ); document.write( "------------------
\n" ); document.write( " y = 127 (number of $2 coins)
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\n" ); document.write( "number of $1 coins:
\n" ); document.write( "x + y = 275
\n" ); document.write( "x + 127 = 275
\n" ); document.write( "x = 275 - 127
\n" ); document.write( "x = 148 \n" ); document.write( "
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