How to find the angle of inclination of a line.
How to write the equation of a graphed line.
How to graph a line in slope-intercept form.
How to define point of concurrency; how to identify the four main points of concurrency in triangles.
How to determine whether lines are parallel, perpendicular, or neither.
How to determine whether two lines in space are parallel or perpendicular.
How to write the vector equation of a line.
How to find the polar equation of a line through the origin (or pole).
How to prove two triangles are similar using a line parallel to a base.
How to write equations describing motion in a straight line given the velocity and the position when t=0.
How to graph a line.
How to show that a function is discontinuous at a point x=a because it is not defined there.
Equations and slopes of horizontal and vertical lines
How to prove that opposite angles in a cyclic quadrilateral are congruent; how to prove that parallel lines create congruent arcs in a circle.
Overview of correlation, scatterplots, and line of best fit
How to graph a line using the x and y intercepts.
How to duplicate a line segment using a compass and straightedge.
How to find a two-sided limit by investigating one-sided limits.