# data[].attributes.headline
Finding the slope of Perpendicular lines:

# data[].attributes.subject
Finding the slope of Perpendicular lines:

# data[].attributes.attachment_link.title
Parallel and Perpendicular Lines - Problem 3 - Algebra Video by Brightstorm

# data[].attributes.attachment_link.description
Math video explaining how to find the equation of a line perpendicular to a given line written in standard form and passing through a given point. Problem 3.

# data[].attributes.attachment_link.title
Parallel and Perpendicular Lines - Problem 1 - Algebra Video by Brightstorm

# data[].attributes.attachment_link.description
Math video explaining how to write the equation of a line the is parallel to a given line through a given point. Problem 1.

# data[].attributes.body
In geometry, a horizontal line is one which runs from left to right across the page.

# data[].attributes.body
A vertical line is one the goes straight up and down, parallel to the y-axis of the coordinate plane

# data[].attributes.body
The slope of perpendicular lines are opposite reciprocals.

# data[].attributes.body
The slopes of parallel lines are the exact same.

# data[].attributes.body
The slope of a line is a number that measures its "steepness", usually denoted by the letter m.