Which axis is associated with the second coordinate in an ordered pair (a, b)?

Which axis is associated with the second coordinate in an ordered pair (a, b)?

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

Answer: (D)

In a standard Cartesian plane, the first value in an ordered pair tells you how far to move along the horizontal axis, while the second value tells you how far to move along the vertical axis. The vertical axis is the Y axis, so the second coordinate is associated with the Y axis. For example, (3, -2) means 3 units to the right and 2 units down. The origin is the point where the axes meet (0,0), not an axis itself, and the Z axis is used for depth in 3D, not part of a typical 2D ordered pair.

In a standard Cartesian plane, the first value in an ordered pair tells you how far to move along the horizontal axis, while the second value tells you how far to move along the vertical axis. The vertical axis is the Y axis, so the second coordinate is associated with the Y axis. For example, (3, -2) means 3 units to the right and 2 units down. The origin is the point where the axes meet (0,0), not an axis itself, and the Z axis is used for depth in 3D, not part of a typical 2D ordered pair.