Which axis is perpendicular to the horizontal axis and passes through the origin?

Which axis is perpendicular to the horizontal axis and passes through the origin?

• A. X axis
• B. Y axis
• C. Origin
• D. Z axis

Answer: (B)

In a standard Cartesian plane, the horizontal axis is the X axis and the axis perpendicular to it is the vertical axis, the Y axis. Since it must pass through the origin, it goes through the point where the X and Y axes intersect, (0,0). So the described axis is the vertical one through the origin. The X axis is the horizontal line itself, not perpendicular to it; the origin is a point, not an axis; and the Z axis is a concept from three-dimensional space and isn’t the line described in this 2D context.

In a standard Cartesian plane, the horizontal axis is the X axis and the axis perpendicular to it is the vertical axis, the Y axis. Since it must pass through the origin, it goes through the point where the X and Y axes intersect, (0,0). So the described axis is the vertical one through the origin. The X axis is the horizontal line itself, not perpendicular to it; the origin is a point, not an axis; and the Z axis is a concept from three-dimensional space and isn’t the line described in this 2D context.