document.write( "Question 1084104: The determinant of a matrix [a, b, c, d] is equal to ad-bc. If [x-y, 3, x-y,3] = k, then what must k be equal to in order for x=y to be true? \n" ); document.write( "

Algebra.Com's Answer #698152 by ikleyn(52866) $\"\"$ $\"About$

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\n" ); document.write( "The determinant of the matrix\r
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\n" ); document.write( "\n" ); document.write( " $\"%28matrix%282%2C2%2C+x-y%2C3%2C+x-y%2C3%29%29\"$ \r
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\n" ); document.write( "\n" ); document.write( "is always zero for any values of x and y.\r
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\n" ); document.write( "\n" ); document.write( "Can you make your conclusions from this fact ??\r
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document.write( "    The conclusion is: the value of \"k\" is identically zero independently of values of x and y.\r\n" );
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