How to subtract two vectors with scalars

The video tutorial explains how to handle vector operations, focusing on the common mistakes students make with subtraction of negative numbers. The instructor suggests rewriting subtraction as addition for clarity and ease. A practical example of vector addition is provided, demonstrating how to add the components of vectors step-by-step.

What does the teacher imply about the majority of students when subtracting negative numbers?

What is the first number mentioned by the teacher in the example?