document.write( "Question 1105045: If you buy seven hamburgers and three sodas at a local fast food restaurant, you receive one dollar in change from a $20 bill. If you buy ate hamburgers and two sodas, you receive $.50 in change from a $20 bill. How much change will you receive from a five dollar bill if you buy one hamburger and one soda \n" ); document.write( "
Algebra.Com's Answer #719987 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
Let \"+a+\" = the cost of 1 hamburger
\n" ); document.write( "Let \"+b+\" = the cost of 1 soda
\n" ); document.write( "-------------------------------------
\n" ); document.write( "(1) \"+7a+%2B+3b+=+19+\"
\n" ); document.write( "(2) \"+8a+%2B+2b+=+19.5+\"
\n" ); document.write( "-------------------------
\n" ); document.write( "(1) \"+7a+%2B+3b+=+19+\"
\n" ); document.write( "(2) \"+80a+%2B+20b+=+195+\"
\n" ); document.write( "(2) \"+16a+%2B+4b+=+39+\"
\n" ); document.write( "-------------------------
\n" ); document.write( "Multiply both sides of (1) by \"+4+\"
\n" ); document.write( "Multiply both sides of (2) by \"+3+\"
\n" ); document.write( "Then subtract (1) from (2)
\n" ); document.write( "------------------------------------
\n" ); document.write( "(2) \"+48a+%2B+12b+=+117+\"
\n" ); document.write( "(1) \"+-28a+-+12b+=+-76+\"
\n" ); document.write( "--------------------------
\n" ); document.write( "\"+20a+=+41+\"
\n" ); document.write( "\"+a+=+41%2F20+\"
\n" ); document.write( "and
\n" ); document.write( "(1) \"+7%2A%2841%2F20%29+%2B+3b+=+19+\"
\n" ); document.write( "(1) \"+287+%2B+60b+=+380+\"
\n" ); document.write( "(1) \"+60b+=+93+\"
\n" ); document.write( "(1) \"+b+=+93%2F60+\"
\n" ); document.write( "----------------------------
\n" ); document.write( "1 hamburger and 1 soda =
\n" ); document.write( "\"+a+%2B+b+=+41%2F20+%2B+93%2F60+\"
\n" ); document.write( "\"+123%2F60+%2B+41%2F60+=+164%2F60+%0D%0A%7B%7B%7B+164%2F60+=+2+%2B+44%2F60+\"
\n" ); document.write( "\"+2+%2B+44%2F60+=+2+%2B+11%2F15+\"
\n" ); document.write( "Change from $5 is \"+2+%2B+4%2F15+\"
\n" ); document.write( "\"+4%2F15+=+.27+\"
\n" ); document.write( "$2.27 is the change from a $5 bill
\n" ); document.write( "check the math!\r
\n" ); document.write( "\n" ); document.write( "
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