document.write( "Question 152655: Where are you looking if the indices i and j are equal in a square matrix?
\n" ); document.write( "a. Along the middle row
\n" ); document.write( "b. Along the middle column
\n" ); document.write( "c. Along the diagonal from the upper left to the lower right
\n" ); document.write( "d. Along the diagonal from the lower left to the upper right \n" ); document.write( "

Algebra.Com's Answer #113728 by Edwin McCravy(20055) $\"\"$ $\"About$

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Where are you looking if the indices i and j are equal in a square matrix?
\n" ); document.write( "a. Along the middle row
\n" ); document.write( "b. Along the middle column
\n" ); document.write( "c. Along the diagonal from the upper left to the lower right
\n" ); document.write( "d. Along the diagonal from the lower left to the upper right
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document.write( "Notice in the matrix:\r\n" );
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document.write( "the way the elements have subscripts, for instance,\r\n" );
document.write( " means the element where  \r\n" );
document.write( "and .\r\n" );
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document.write( "The first subscript, which is denoted by , is\r\n" );
document.write( "the number of the row it's in and the second subscript,\r\n" );
document.write( "which is denoted by  is the number of the column \r\n" );
document.write( "that it's in.\r\n" );
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document.write( "So picking out the elements where i and j are equal,\r\n" );
document.write( "they are \r\n" );
document.write( ", , , and    \r\n" );
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document.write( "Notice they appear on the diagonal that goes from the upper\r\n" );
document.write( "left corner to the bottom right corner.\r\n" );
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document.write( "So the answer is (c).\r\n" );
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document.write( "Edwin

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