document.write( "Question 1157077: x + 2 y = 20 ; x + 3 y = 10 \n" ); document.write( "

Algebra.Com's Answer #779867 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "You may express x from the first equation and substitute it then to the second equation.\r\n" );
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document.write( "It is how the SUBSTITUTION method works in this case.\r\n" );
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document.write( "You also can subtract the second equation from the first.\r\n" );
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document.write( "It is how the ELIMINATION method works in this problem.\r\n" );
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document.write( "Select any of these two methods and do the rest on your ow.\r\n" );
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document.write( "If you still have questions, let me know (by referring to the problem's ID number 1157077).\r\n" );
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\n" ); document.write( "\n" ); document.write( "If you need some introductory guidance on solving system of equations, you will find it in 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
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