Video Transcript
Determine whether the lines π¦
equals negative one-seventh π₯ minus five and π¦ equals negative one-seventh π₯
minus one are parallel, perpendicular, or neither.
The categories parallel,
perpendicular, or neither are always, we categorize, intersections of lines. Parallel lines do not
intersect. Perpendicular lines intersect at a
90-degree angle. The category neither here
represents all the lines that do intersect but do not form a 90-degree angle. Parallel, perpendicular, or
neither.
But weβre not given a graph for
these two lines. Of course, we could try and draw a
graph for both of these lines. But we can determine parallel,
perpendicular, or neither without graphing these two equations. Both of these straight lines are
given in the form π¦ equals ππ₯ plus π. In both cases, the coefficient of
π₯ β the π variable β is negative one-seventh. The π variable represents the
slope. And so, we can say that the slope
of line one is negative one-seventh and the slope of line two is negative one
seventh, which reminds us, βparallel lines have the same slope.β That is why they do not
intersect. Since both of these lines have a
slope of negative one-seventh, we can classify them as parallel lines without
graphing.
