For a more formal introduction and explanation of PARALLEL lines, see https://youtu.be/77bDq4gQ_AQ
For a more formal introduction and explanation of PERPENDICULAR lines, see https://youtu.be/LAoamWlNnsE
This video works through #29-32 on the Algebra 1, Chapter 2 Review for the 2015-2016 school year. The instructions tell us to "Write the slope-intercept form of the equation of the line described."
For more math help and resources, visit www.hsmathsolutions.com.