Without them, you wouldn't be able to graph.
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Quadrants 2 and 3 have negative X values.
X-Y Coordinates Origin Quadrants Points
Analytical geometry is more commonly known as coordinate geometry. Using Cartesian, Polar or other coordinates systems, geometric shapes can be represented in algebraic terms. This bringing together of algebra and geometry enables the results in one branch of mathematics to be applied to finding solutions in the other.
I assume you mean (8, 0). If one or both of the coordinates are zero, the point is not in any of the four quadrants. Instead, it is on the axes - between two quadrants.
They satisfy the equation x + y = 0