document.write( "Question 1190188: 6. The following are system of linear equation in two variables, except.\r
\n" ); document.write( "\n" ); document.write( "a. $\"system%28x+%2B+y+=+11%2C++x+-+y+=+4%29\"$
\n" ); document.write( "b. $\"system%28-x+=+5%2C+y+-+4y+=+2+%29\"$
\n" ); document.write( "c. $\"system%28x+%2B+4+=+y%2C2x+-+2y+=+-8%29\"$
\n" ); document.write( "d. $\"system%28x+%2B+8y+=+8%2C3x+%2B+y+=+18%29\"$ \n" ); document.write( "

Algebra.Com's Answer #821772 by Edwin McCravy(20055) $\"\"$ $\"About$

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document.write( "An equation is said to be linear equation in two variables\r\n" );
document.write( "if it is written in the form of ax + by = c, where a, b & c \r\n" );
document.write( "are real numbers and the coefficients of x and y, i.e \r\n" );
document.write( "a and b respectively, are not equal to zero.\r\n" );
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document.write( "a.     \r\n" );
document.write( "b.    \r\n" );
document.write( "c.     \r\n" );
document.write( "d. \r\n" );
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document.write( "In the choice (b.),  there is no y in the first equation,\r\n" );
document.write( "which means that -x = 5 is equivalent to -x + 0y = 5, which\r\n" );
document.write( "means that the coefficient of y is equal to 0.  That means\r\n" );
document.write( "that it cannot be a linear equation in two variables.\r\n" );
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document.write( "Also in the choice (b.), there in no x in the second equation,\r\n" );
document.write( "which means that y - 4y = 2, or -3y = 2 is equivalent to\r\n" );
document.write( "0x - 3y = 2, which means that the coefficient of x is equal\r\n" );
document.write( "to 0.  That is further reason that it cannot be a linear\r\n" );
document.write( "equation in two variables.\r\n" );
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document.write( "Edwin

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