document.write( "Question 151368: Determine whether the lines are parallel, perpendicular, or neither.
\n" ); document.write( "y = 1/7x - 20
\n" ); document.write( "y = 7x + 15 \n" ); document.write( "

Algebra.Com's Answer #111253 by Earlsdon(6294) $\"\"$ $\"About$

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To determine this you will need to compare the slopes of the two lines.
\n" ); document.write( "Parallel lines have identical slopes.
\n" ); document.write( "Perpendicular lines have slopes that are the negative reciprocal of each other.
\n" ); document.write( "If the slopes are none of the above, then the lines are neither parallel nor perpendicular.
\n" ); document.write( "The given equations are, conveniently, already in slope-intercept form: y = mx+b, so you can read the slopes, m, of the two lines.
\n" ); document.write( "Slope 1: $\"m%5B1%5D+=+1%2F7\"$
\n" ); document.write( "Slope 2: $\"m%5B2%5D+=+7\"$
\n" ); document.write( "As you can see, the slope are neither equal nor negative reciprocals, so the lines are neither parallel nor perpendicular. \n" ); document.write( "

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