Worked examples identifying the equations and slope of horizontal and vertical lines.

Practice your knowledge of horizontal and vertical lines: their graphical presentation, their slopes, and their equations.

When two points have the same y-value, it means they lie on a horizontal line. The slope of such a line is 0, and you will also find this by using the slope formula.

Parallel lines are lines in the same plane that go in the same direction and never intersect. When a third line, called a transversal, crosses these parallel lines, it creates angles.

Contour lines outline all the figures and forms in the image, creating the illusion of shading and form. In addition, there are horizontal lines in the background. While these create shading, but they also help …

Because a horizontal line (parallel to x-axis) has a slope of 0, and the line perpendicular to that will a vertical line (parallel to y-axis) and has an undefined slope.

A standard rectangle has two lines of symmetry. There is a vertical line and a horizontal line that both goes through the center of the rectangle.

Both graphs show the change in position of an object over a period of time and are similar to each other. However, the term "displacement" highlights the object's overall change in position from its starting …

Slope tells us how steep a line is. It's like measuring how quickly a hill goes up or down. We find the slope by seeing how much we go up or down (vertical change) for each step to the right (horizontal …

Review symmetrical shapes and lines of symmetry. Then, try some practice problems.