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Khan Academy: Trolls, kings, and solving systems of equations
Sal has created new algebra videos to explain solving systems of equations: Trolls, Tolls, and Systems of Equations Then check out the follow-up videos on Solving the Troll Riddle Visually and Solving Systems Graphically. Elimination The King’s planning a party and needs your help figuring out how many cupcakes to order. King’s Cupcakes: Solving Systems by Elimination This video leads into the first exercise on elimination, which has a new guide video: Simple Elimination Practice. Then, the King needs more party planning help in managing The Potato Chip Issue: How many bags of potato chips do people eat? This leads into the next exercise on elimination, which also has a new companion video. Substitution Next, a little bird visits the King to teach him a new solving method: substitution. Talking bird solves systems with substitution The exercise using substitution has a new companion video. Solutions to Systems Sal then investigates spec…