California Assessment of Student Performance and Progress (CAASPP) Math Practice Exam

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Which of the following describes an axis?

A short line segment
A vertical or horizontal number line for coordinate grids
A curved line on a graph
A constant value on a graph

The correct answer is: A vertical or horizontal number line for coordinate grids

The description of an axis as a vertical or horizontal number line for coordinate grids is accurate because an axis serves as a reference line against which points are plotted in a coordinate system. In two-dimensional graphs, there are typically two axes: the horizontal axis (x-axis) and the vertical axis (y-axis). These axes allow for the precise placement of points in a Cartesian coordinate system, enabling the representation of equations and relationships between variables. The axes provide essential structure to the graph, defining the scale and orientation of the plotted data. In contrast, a short line segment does not encompass the broader function of an axis in graphing. A curved line on a graph can represent a function or relationship but does not convey the foundational role of a coordinate reference. Similarly, a constant value on a graph may represent a horizontal line but lacks the comprehensive function of indicating the coordinate system's framework. Thus, defining an axis in terms of its vital role as a number line in coordinate grids captures its essence accurately.