document.write( "Question 1071619: The sum of 4 times the first number and 10 times the second number is 48. The sum of 10 times the first number and 4 times the second number is 36. What are the two numbers?
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Algebra.Com's Answer #686504 by ikleyn(52814)![]() ![]() You can put this solution on YOUR website! . \n" ); document.write( " \r\n" ); document.write( "4x + 10y = 48, (1)\r\n" ); document.write( "10x + 4y = 36. (2)\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "Multiply equation (1) by 5 (both sides).\r\n" ); document.write( "Multiply equation (2) by 2 (both sides). You will get\r\n" ); document.write( "\r\n" ); document.write( "20x + 50y = 240, (3)\r\n" ); document.write( "20x + 8y = 72. (4)\r\n" ); document.write( "\r\n" ); document.write( "Subtract eq(4) from eq(3) (both sides). You will get\r\n" ); document.write( "\r\n" ); document.write( "42y = 240-72 = 168 ---> y =\r \n" ); document.write( "\n" ); document.write( "The method I applied here is called the Elimination method.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "See the lessons \r \n" ); document.write( "\n" ); document.write( " - Solution of the linear system of two equations in two unknowns by the Substitution method \r \n" ); document.write( "\n" ); document.write( " - Solution of the linear system of two equations in two unknowns by the Elimination method \r \n" ); document.write( "\n" ); document.write( " - Solution of the linear system of two equations in two unknowns using determinant \r \n" ); document.write( "\n" ); document.write( " - Geometric interpretation of the linear system of two equations in two unknowns \r \n" ); document.write( "\n" ); document.write( " - Solving word problems using linear systems of two equations in two unknowns \r \n" ); document.write( "\n" ); document.write( " - OVERVIEW of lessons on solving systems of two linear equations in two unknowns\r \n" ); document.write( "\n" ); document.write( "in this site.\r \n" ); document.write( " \n" ); document.write( " \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 \n" ); document.write( " \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 \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |