The x-axis intersects with the y-axis at the origin (0,0).
Points on the x-axis have a y-coordinate of 0.
The equation $x = c$ represents a vertical line parallel to the y-axis and intersects the x-axis at point $(c, 0)$.
In inequalities, shading above or below a line depends on whether you are dealing with $>\text{ or }\geq$ versus $<\text{ or }\leq$. For example, $y < mx + b$ shades below the line.
In trigonometry, angles measured counterclockwise from the positive x-axis correspond to positive angle measures.
Review Questions
What are the coordinates of any point located on the x-axis?
How does one identify if an equation represents a vertical line parallel to the y-axis?
Where do you shade for inequality $y > mx + b$?
Related terms
y-axis: The vertical axis in a rectangular coordinate system, used to determine vertical positions of points on a graph.
Origin: The point where both x and y-axes intersect in a coordinate system, represented as (0,0).
$y = mx + b$: $y = mx + b$ is the slope-intercept form of an equation for a straight line where $m$ is the slope and $b$ is the y-intercept.