document.write( "Question 1063210: A dozen cookies and a loaf of bread cost $6.70. Half a dozen cookies and 2 loaves of bread cost $6.20. A loaf of bread costs? \n" ); document.write( "

Algebra.Com's Answer #678266 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+a+\"$ = the cost of a half dozen cookies
\n" ); document.write( " $\"+2a+\"$ = the cost of a dozen cookies
\n" ); document.write( "Let $\"+b+\"$ = the cost of a loaf of bread
\n" ); document.write( "-----------------------------------------
\n" ); document.write( "(1) $\"+2a+%2B+b+=+670+\"$ ( in cents )
\n" ); document.write( "(2) $\"+a+%2B+2b+=+605+\"$ ( in cents )
\n" ); document.write( "Multiply both sides of (2) by $\"+2+\"$ and
\n" ); document.write( "subtract (1) from (2)
\n" ); document.write( "(2) $\"+2a+%2B+4b+=+1210+\"$
\n" ); document.write( "(1) $\"+-2a+-+b+=+-670+\"$
\n" ); document.write( "-----------------------
\n" ); document.write( " $\"+3b+=+540+\"$
\n" ); document.write( " $\"+b+=+180+\"$ cents
\n" ); document.write( "A loaf of bread costs $1.80
\n" ); document.write( "---------------------------
\n" ); document.write( "check:
\n" ); document.write( "(1) $\"+2a+%2B+b+=+670+\"$
\n" ); document.write( "(1) $\"+2a+%2B+180+=+670+\"$
\n" ); document.write( "(1) $\"+2a+=+490+\"$
\n" ); document.write( "(1) $\"+a+=+245+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+a+%2B+2b+=+605+\"$
\n" ); document.write( "(2) $\"+245+%2B+2%2A180+=+605+\"$
\n" ); document.write( "(2) $\"+245+%2B+360+=+605+\"$
\n" ); document.write( "(2) $\"+605+=+605+\"$
\n" ); document.write( "OK
\n" ); document.write( " \n" ); document.write( "

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