The graph displays the number of tickets available (not yet sold) for the number of hours since the theater opened at noon. Calculate the slope for the Play Story line and interpret its meaning. 
Definitions:
Savanna
A mixed ecosystem characterized by the coexistence of trees and grasses, typically found in regions with a seasonal rain pattern.
Tundra
Tundra is a biome characterized by cold climates, minimal tree growth, and short growing seasons, found primarily in the Arctic regions and atop high mountains.
Alpine Lake
A high-altitude lake, typically found in mountainous regions, formed in valleys carved by glaciers and known for its clear, cold waters.
Species Richness
A measure of the number of different species present in a specific ecological community or region.
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