document.write( "Question 1084632: When making a telephone call using a calling card, a call lasting 6 minutes cost $1.65. A call lasting 15 minutes cost $3.45. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that models the cost of a making a call lasting x minutes. \n" ); document.write( "

Algebra.Com's Answer #698809 by jorel1380(3719) $\"\"$ $\"About$

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Let c be the fixed cost of making a call, and x be the variable cost, in minutes. Then:
\n" ); document.write( "c+6x=1.65
\n" ); document.write( "c+15x=3.45
\n" ); document.write( "So:
\n" ); document.write( "9x=1.80
\n" ); document.write( "x=.2
\n" ); document.write( "So
\n" ); document.write( "y=.2x+.45
\n" ); document.write( "☺☺☺☺ \n" ); document.write( "

\n" );