document.write( "Question 1106664: solve the system of equations:
\n" ); document.write( "verify the solution by replacing the values in the original equations;\r
\n" ); document.write( "\n" ); document.write( "y= 3x-7
\n" ); document.write( "y= -x+9\r
\n" ); document.write( "\n" ); document.write( "I am just not understanding what they want done. \n" ); document.write( "

Algebra.Com's Answer #721657 by ikleyn(52788) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "Look into the two equations. Their left sides are IDENTICAL, right ?\r\n" );
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document.write( "Hence, their right sides are equal:\r\n" );
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document.write( "3x - 7 = -x + 9\r\n" );
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document.write( "3x + x = 9 + 7\r\n" );
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document.write( "4x = 16  ====>  x =  = 4.\r\n" );
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document.write( "Then from the first equation y = 3x-7 = 3*4 - 7 = 12-7 = 5.\r\n" );
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document.write( "Answer.  x= 4,  y= 5.\r\n" );
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\n" ); document.write( "\n" ); document.write( "2. Checking / (verifying)\r
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document.write( "Substitute the obtained values x= 5, y= 5 into the original equations.\r\n" );
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document.write( "a)  First equation becomes  5 = 3*4 - 7.   Is is true ?   - YES, it is.  Thus first equation is just checked.\r\n" );
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document.write( "b)  Second equation becomes  5 = -4 + 9.   Is it TRUE ?  -  YES, it is.  Thus second equation is just checked, too.\r\n" );
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document.write( "---------------------\r\n" );
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\n" ); document.write( "\n" ); document.write( "The check is completed.\r
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\n" ); document.write( "\n" ); document.write( "The solution is completed.\r
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\n" ); document.write( "\n" ); document.write( "You are done.\r
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