document.write( "Question 979869: Do the following two lines intersect? 5x+8y=-5 and -x-1.6y=14 \n" ); document.write( "
Algebra.Com's Answer #601113 by Cromlix(4381)\"\" \"About 
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Hi there,
\n" ); document.write( "5x + 8y = -5
\n" ); document.write( "Sort into y = mx + c
\n" ); document.write( "8y = -5x - 5
\n" ); document.write( "y = -5/8 - 5/8
\n" ); document.write( ".........
\n" ); document.write( "-x - 1.6y = 14
\n" ); document.write( "Sort into y = mx + c
\n" ); document.write( "-1.6y = x + 14
\n" ); document.write( "y = x/-1.6 + 14/-1.6
\n" ); document.write( "..............
\n" ); document.write( "The two gradients
\n" ); document.write( "-5/8 = 1/-1.6
\n" ); document.write( "Therefore the lines are parallel
\n" ); document.write( "and will never intersect.
\n" ); document.write( "Their only difference is their y intersections.
\n" ); document.write( "Hope this helps:-)
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