1. “Vector OA” or “Vector v” B A
Vector: like a ‘line segment’ but, has both “magnitude” (length) and direction (degree). Normally shown as a ray with only one part of the arrow, book uses a ray.
y-axis
x-axis
Red vector  or
“Vector OA” or “Vector v” B A O v
Blue vector 
“vector AB”
Order (of the letters) when naming a vector (ray) is very important. First letter is the beginning point, second letter the terminating (ending) point.

2. “Vector OA” or “Vector v” B A
y-axis
x-axis
Red vector  or
“Vector OA” or “Vector v” B A O v
Blue vector 
“vector AB”
Order (of the letters) when naming a vector (ray) is very important. First letter is the beginning point, second letter the terminating (ending) point.
Standard position: vector starting at the origin
red vector OA above.
Vectors do NOT have to be in the 1st Quadrant.

3. “Vector OA” or “Vector v” B A
y-axis
x-axis
Red vector  or
“Vector OA” or “Vector v” B A O v
Blue vector 
“vector AB”
For VECTORS the component is ‹∆x, ∆y›
‹the change in x, by the change y ›
Vector OA 2, 3 & Vector AB –3, 0
Name the vector and write its component form. J M

4. No, naming a vector does NOT always go alphabetically!
Name the vector and write its component form. R D J M X Y
No, naming a vector does NOT always go alphabetically!
𝒗 = magnitude (distance) of the composite vector
𝒗 = magnitude (distance) of the composite vector