The horizontal axis in a coordinate plane.

The horizontal axis in a coordinate plane.

• A. X Axis
• B. Product
• C. Equilateral Triangle
• D. Quadrant

Answer: (A)

The horizontal reference line on a coordinate plane is called the x-axis. It runs left to right, and points along it have a y-coordinate of zero while their x-coordinate determines their position. The vertical line is the y-axis, which runs up and down and has an x-coordinate of zero. So when you plot a point, you read its position as (x, y), with x indicating how far along the horizontal axis you go. The other terms don’t fit: a product is unrelated to graph axes, an equilateral triangle is a geometric shape, and a quadrant is one of the four regions formed by the two axes, not the axis itself.

The horizontal reference line on a coordinate plane is called the x-axis. It runs left to right, and points along it have a y-coordinate of zero while their x-coordinate determines their position. The vertical line is the y-axis, which runs up and down and has an x-coordinate of zero. So when you plot a point, you read its position as (x, y), with x indicating how far along the horizontal axis you go.

The other terms don’t fit: a product is unrelated to graph axes, an equilateral triangle is a geometric shape, and a quadrant is one of the four regions formed by the two axes, not the axis itself.