**Addition of two Vectors**

Vertical line test is a visual way of determining that the given relation is a function or not. If the vertical line drawn intersects the graph of the relation at more than one point then the given relation is not a function. If it intersect at one point then it is a function. With the vertical line test we check the one to one relation. A function can have only one y value for each unique value of ‘x’.

**Subtraction of two Vectors**

Vertical line test is a visual way of determining that the given relation is a function or not. If the vertical line drawn intersects the graph of the relation at more than one point then the given relation is not a function. If it intersect at one point then it is a function. With the vertical line test we check the one to one relation. A function can have only one y value for each unique value of ‘x’.