What value do points west of the Prime Meridian carry?

Points west of the Prime Meridian carry negative values. The Prime Meridian, which is established at 0 degrees longitude, serves as the baseline for measuring longitude. As you move westward from this line, the longitude values decrease and are classified as negative. For example, a location at 15 degrees west longitude is represented as -15 degrees. This system of assigning negative values allows for a consistent and clear geographic reference framework across the globe for mapping and navigation.

In this context, it's important to note that points to the east of the Prime Meridian are assigned positive values, while the Prime Meridian itself is represented as zero. This differentiation is crucial for spatial analysis and geographic data representation.