document.write( "Question 1110009: Gilbert makes frequent calls from country A to country B. His calling plan costs​ $5.00 per month plus 7¢ per minute for calls made to a landline and 17¢ per minute for calls made to a wireless number. One month his bill was ​$55.50. If he talked for a total of 350 ​min, how many minutes were to a landline and how many minutes to a wireless​ number? \n" ); document.write( "
Algebra.Com's Answer #725035 by ikleyn(52788)\"\" \"About 
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document.write( "The given problem is equivalent to this system of 2 equations in 2 unknowns\r\n" );
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document.write( " x +   y = 350,                 (1)     (counting minutes)\r\n" );
document.write( "7x + 17y = 5550 - 500           (2)     (counting dollars and cents)\r\n" );
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document.write( "After substitution  y = 350 - x  from the first equation to the second equation, the system is reduced to a single equation for only ONE unknown\r\n" );
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document.write( "7x + 17*(350-x) = 5050,\r\n" );
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document.write( "7x + 17*350 - 17x = 5050,\r\n" );
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document.write( "-10x = 5050 - 17*350 = -900  ====>  x = 90.\r\n" );
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document.write( "Answer.  90 landline minutes and the rest 350-90 = 260 wireless minutes.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved.   //   On the way, you learned on how the Substitution method works.\r
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\n" ); document.write( "To see other similar solved problems,  look into the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Oranges and grapefruits \r
\n" ); document.write( "\n" ); document.write( "    - Using systems of equations to solve problems on tickets \r
\n" ); document.write( "\n" ); document.write( "    - Three methods for solving standard (typical) problems on tickets\r
\n" ); document.write( "\n" ); document.write( "    - Using systems of equations to solve problems on shares \r
\n" ); document.write( "\n" ); document.write( "    - Using systems of equations to solve problems on investment\r
\n" ); document.write( "\n" ); document.write( "    - Two mechanics work on a car \r
\n" ); document.write( "\n" ); document.write( "    - The Robinson family and the Sanders family each used their sprinklers last summer\r
\n" ); document.write( "\n" ); document.write( "    - Roses and vilolets \r
\n" ); document.write( "\n" ); document.write( "    - Counting calories and grams of fat in combined food\r
\n" ); document.write( "\n" ); document.write( "    - HOW TO algebreze and solve this problem on 2 equations in 2 unknowns \r
\n" ); document.write( "\n" ); document.write( "    - One unusual problem to solve using system of two equations \r
\n" ); document.write( "\n" ); document.write( "    - Solving mentally word problems on two equations in two unknowns \r
\n" ); document.write( "\n" ); document.write( "    - Solving systems of non-linear equations by reducing to linear ones \r
\n" ); document.write( "\n" ); document.write( "    - System of equations helps to solve a problem for the Thanksgiving day\r
\n" ); document.write( "\n" ); document.write( "    - Using system of two equations to solve the problem for the day of April, 1 \r
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\n" ); document.write( "\n" ); document.write( "    - OVERVIEW of lessons on solving systems of two linear equations in two unknowns\r
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\n" ); document.write( "\n" ); document.write( "Also,  you have this free of charge online textbook in ALGEBRA-I in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic \"Systems of two linear equations in two unknowns\".\r
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\n" ); document.write( "\n" ); document.write( "Save the link to this online textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-I
\n" ); document.write( "https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "to your archive and use it when it is needed.\r
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