00:01
The points a, b, and c from the vertices of a triangle a, b, c as shown in the figure, the point d is the midpoint of a .c has coordinates of 15, c has coordinates of 15 negative 3.
00:21
So c has coordinates of 15 comma negative 3.
00:27
Line l, which passes through d, is perpendicular to the to ac, bisects intersect ab at e.
00:42
So intersects ab at e.
00:45
So maybe e is right here.
00:48
So it's perpendicular.
00:49
Oops.
00:51
This is the line.
00:55
And erase.
00:59
So perpendicular means that it's going to create a 90 degree angle when it intersects here and here.
01:07
Ok.
01:07
I'm sorry, here, line ac.
01:12
The equation of line l is this.
01:17
Find the exact x coordinate of e.
01:22
Okay, so first of all, i know that the y coordinate is 7, so x, comma, 7.
01:31
Okay.
01:32
And if it is perpendicular, it's going to have opposite slope.
01:38
So first of all, i have to find the slope of a.
01:41
C...