document.write( "Question 140875: Hi my question is this: A 35-minute phone call cost $4.95.Introductory minutes cost $.16/min and additional minutes are $.11/min. How many minutes were billed at each rate?
\n" ); document.write( "I used to know how to do this problem but i for get can you please help me? \n" ); document.write( "

Algebra.Com's Answer #102531 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"a\"$ =introductory minutes
\n" ); document.write( "Let $\"b\"$ = additional minutes
\n" ); document.write( " $\"a+%2B+b+=+35\"$
\n" ); document.write( " $\"b+=+35+-+a\"$
\n" ); document.write( " $\"16a+%2B+11b+=+495\"$
\n" ); document.write( " $\"16a+%2B+11%2A%2835+-+a%29+=+495\"$
\n" ); document.write( " $\"16a+%2B+385+-+11a+=+495\"$
\n" ); document.write( " $\"5a+=+495+-+385\"$
\n" ); document.write( " $\"5a+=+110\"$
\n" ); document.write( " $\"a+=+22\"$
\n" ); document.write( " $\"b+=+35+-+a\"$
\n" ); document.write( " $\"b+=+35+-+22\"$
\n" ); document.write( " $\"b+=+13\"$
\n" ); document.write( "22 minutes were billed at introductory rate
\n" ); document.write( "13 minutes were billed at additional rate
\n" ); document.write( "check:
\n" ); document.write( " $\"16a+%2B+11b+=+495\"$
\n" ); document.write( " $\"16%2A22+%2B+11%2A13+=+495\"$
\n" ); document.write( " $\"352+%2B+143+=+495\"$
\n" ); document.write( " $\"495+=+495\"$
\n" ); document.write( "OK \n" ); document.write( "

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