Which term describes the second number in an ordered pair?

Which term describes the second number in an ordered pair?

• A. X-coordinate
• B. Domain
• C. Y-coordinate
• D. Second number

Answer: (C)

In a coordinate pair, the second number tells the vertical position on the plane—the y-coordinate. The first number is the x-coordinate, which tells how far to the right or left. So the second number specifically names the height, up or down from the origin. For example, in the pair (3, -5), the second number is -5, meaning 5 units down from the origin. The term describing that second value is the y-coordinate. The x-coordinate refers to the first number, and the domain is the set of possible x-values, not the second number.

In a coordinate pair, the second number tells the vertical position on the plane—the y-coordinate. The first number is the x-coordinate, which tells how far to the right or left. So the second number specifically names the height, up or down from the origin. For example, in the pair (3, -5), the second number is -5, meaning 5 units down from the origin. The term describing that second value is the y-coordinate. The x-coordinate refers to the first number, and the domain is the set of possible x-values, not the second number.