document.write( "Question 2732: I am studing the substitution Method.. and for some reason i can not seem to figure out how to do it. My teacher has been trying to work with me, but yet when I look at the problem I go blank on what to do.
\n" ); document.write( "I have an equation y = 2x + 7
\n" ); document.write( " y = 10x - 1 I dont understand how to do this...
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #853873 by MathTherapy(10791) $\"\"$ $\"About$

You can put this solution on YOUR website!

\r\n" );
document.write( "I am studing the substitution Method.. and for some reason i can not seem to figure out how to do it.\r\n" );
document.write( "My teacher has been trying to work with me, but yet when I look at the problem I go blank on what to do. \r\n" );
document.write( "I have an equation y = 2x + 7\r\n" );
document.write( "                   y = 10x - 1   I dont understand how to do this...\r\n" );
document.write( "********************************************************************\r\n" );
document.write( "\r\n" );
document.write( "I have no idea why the person who responded did this: y=2x+7\r\n" );
document.write( "2x=y-7\r\n" );
document.write( "x=(y-7)/2 ...... [3]\r\n" );
document.write( "\r\n" );
document.write( "What could possibly make someone solve for \"x,\" and create a 3rd equation, WITH  a FRACTION,\r\n" );
document.write( "and making things MUCH MORE COMPLEX, when the given equations are: y = 2x + 7\r\n" );
document.write( "                                                                                                                                y = 10x - 1   \r\n" );
document.write( "Isn't that the MOST SIMPLEST a system can ever be, READY to be solved using the SUBSTITUTION method? \r\n" );
document.write( "y = 2x + 7 ---- eq (i)\r\n" );
document.write( "y = 10x - 1 --- eq (ii)\r\n" );
document.write( "\r\n" );
document.write( "The above system MEANS that 2x + 7 = 10x - 1\r\n" );
document.write( "                                                  2x - 10x = - 1 - 7  \r\n" );
document.write( "                                                          - 8x = - 8\r\n" );
document.write( "                                                              x = \r\n" );
document.write( "\r\n" );
document.write( "                                                              y = 2x + 7\r\n" );
document.write( "                                                              y = 2(1) + 7 ----- Substituting 1 for x in eq (i)\r\n" );
document.write( "                                                              y = 2 + 7 = 9\r\n" );
document.write( "\r\n" );
document.write( "                                     Solution set:

\n" ); document.write( "

\n" );