Basic Vectors
What are column vectors?
- A column vector can be used to describe how to get from one point to another point
- This is also called a translation vector
- means 6 units to the right and 3 units up
How do I add and subtract column vectors?
- Adding and subtracting vectors is done by looking at the top numbers and bottom numbers separately
- To add column vectors
- Add the top numbers together
- Add the bottom numbers together
- To subtract column vectors
- Subtract the second top number from the first
- Subtract the second bottom number from the first
How do I multiply a vector by a scalar?
- A scalar is number not a vector
- It does not have a direction
- To multiply a column vector by a scalar
- Multiply the top number by the scalar
- Multiply the bottom number by the scalar
How do I write an expression as a single column vector?
- You need to follow the order of operations
- STEP 1
Multiply each vector by the scalar in front of it - STEP 2
Add or subtract the new column vectors
Worked example
and .
Given that , find the value of and the value of .
Write the left-side side as one vector
Multiple each vector by the scalar in front of it
Add the vectors together
The top components are equal
Form and solve an equation
The bottom components are equal
and