Is the line through points P(2,-9) and Q(6, -13) perpendicular to the line through points R(5,-1) and
1 answer:
Two lines
are perpendicular if their slopes are in a relation
.
So we need to find slopes and if the above relation holds then we can claim the lines are perpendicular.
To find slopes, use slope formula

The first slope of a line passing through
is

The second slope of a line passing through
is

Now check if
is true

This means the two lines <em>are</em> perpendicular.
Hope this helps.
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