A vector is a quantity with both direction and magnitude, just like the despicable me villain Vector. The magnitude in basic terms is size, so by how much. The way that a the vector is written can vary depending on where you are an what you are taught. The first is like a fraction with the number across on top and the number up and down on the bottom. The difference in appearance between a vector and a fraction is the fact that a vector has brackets around it and no line between the two numbers. A vector may just be written as a letter like a. In text books they may put the writing in bold and when hand writing it you put a small wavy line underneath the letter.
Here are 4 basic rules to follow when completing vectors:
1. If its going up or forwards, its a positive number.
2. If its going down or backwards the vector is negative.
3. You add the top numbers and the bottom numbers independently.
4. When writing a vector write the letter your starting at, then the letter your finishing at with and arrow going from one to the other, in the right direction.