Question

How do latitude and longitude help in locating a point? Why is only one of them insufficient in doing this? ​

Answer 1

Hey mate,☺️☺️
Here is your answer,☺️☺️

Longitude and latitude is the basic coordinate system and each coordinate only occurs once, unlike a UTM projection. 

To find the N/S everything is based off of 0 which happens to be the equator. If you are north of the equator you are ºN, if you are below the equator, you are in º. 

For E/W everything is based off the Prime Meridian. If you are west of the Prime Meridian you are ºW if you are east of the Prime Meridian, you are ºE. 

As such, you will always know where you are as each coordinate is unique.

Hope that it will help you a lot in your future.☺️☺️
THANK YOU FRIEND ☺️☺️

Answer 2

Latitudes and longitudes form a grid. Two different points may lie on the same latitude or the same longitude. But there exists only one point where latitude and longitude intersect. So a point can be identified with the help of the latitude and longitude on which it lies.