Your notation is incorrect.
Then
Now you do the others.
I have always had problems with vectors and now need help to understend this simpe task:
Given triangle ABC with vertices A(-2; 5), B(-5; 4), C(1;1).
Find:
1)vecto coordinates and length
2) internal angle to vertice B
3) general equation of line AB
4) general equation of height CD
5)edge AB and height CD intersection D
For 1st I think that
to #3: There are 4 different equations:
These equations describe the same line:
Passing through B in direction AB
Passing through A in direction BA
Passing through B in direction BA
to #4: The height CD is perpendicular to AB, that means is a normal vector to :
. Thus the equation of CD is:
to #5: Calculate the coordinates of the intersection point of the line in #3 and in #4:
will yield a system of simultaneous equations:
I've got