document.write( "Question 466356: What must be true about the slopes of two perpendicular lines, neither of which is vertical?
\n" ); document.write( "a. The slopes are equal.
\n" ); document.write( "b. The slopes have product 1.
\n" ); document.write( "c. the slopes have product -1.
\n" ); document.write( "d. One of the slopes must be 0. \n" ); document.write( "

Algebra.Com's Answer #319699 by jorel1380(3719) $\"\"$ $\"About$

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a.)If the lines are parallel, their slopes are equal.. \n" ); document.write( "

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