No Child Left Behind (NCLB) Proficiency Practice Exam

Which axis intersects the horizontal axis at the origin?

X axis Y axis Origin Z axis

Correct Answer:

Y axis

Explanation:

On a standard Cartesian plane, the horizontal axis is the X axis and the vertical axis is the Y axis. They cross at the origin, the point (0,0). The axis that intersects the horizontal axis exactly at that point is the Y axis, because it passes through x = 0 and meets y = 0 there. The X axis itself also contains the origin, but the axis that crosses the horizontal axis at that specific point is the vertical Y axis.

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