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# In the rectangular coordinate system, the vertical number line is called the__?

A rectangular coordinate system consists of two number lines perpendicular to one another representing points in a two-dimensional plane.

## Answer: In the rectangular coordinate system the vertical number line is called the y-axis.

Let's go through the explanation to understand better.

**Explanation:**

A Cartesian plane is defined with the help of two perpendicular number lines: the x-axis, which is horizontal, and the y-axis, which is vertical. The cartesian plane can exist in all directions and up to any length. The coordinate point (x, y) on the Cartesian plane tells us that the horizontal distance of the point from the origin is x, and the vertical distance is y.

### Hence, in the rectangular coordinate system, the vertical number line is called the y-axis.

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