00:01
Okay, here i want to find two lines, one parallel to and one perpendicular to the line given.
00:07
Both lines going through negative 1, negative 2.
00:10
So, first step is rewrite this as y equals 2x minus 8.
00:19
Let's change it around, make y as subject.
00:22
Now, in that format here, y equals mx plus b.
00:31
M is the slope.
00:33
So 2 here is the slope.
00:39
So slope of the given line is 2, which implies slope of perpendicular line is negative 1 over 2.
00:58
If two lines are at right angles, the slope product is negative 1.
01:02
In other words, if 1 is a, other 1 is negative 1 over a.
01:07
Now, let's do the parallel one first.
01:13
So parallel implies the same slope.
01:19
So we have y equals mx plus b is my line equation.
01:26
Every line you can write in that form.
01:28
Same slope means we have slope of two...