The substitution method | Systems of equations | 8th grade | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-systems-topic/cc-8th-systems-with-substitution/v/the-substitution-method The Substitution Method Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org ...
YouTube
· Mar 10, 2011