Unit 4 Day 1 Graphing Systems of Equations (first 7 min): https://www.youtube.com/watch?v=fSQC0tbk7ao
Unit 4 Day 2 Graphing Systems of Inequalities (7-13 min): https://www.youtube.com/watch?v=fSQC0tbk7ao
Unit 4 Day 3 Elimination +/- (0-5:12 min): https://www.youtube.com/watch?v=xNFxQxRzng8
Unit 4 Day 4 Elimination * (5:13-16:17 min): https://www.youtube.com/watch?v=xNFxQxRzng8
Unit 4 Day 6 Substitution: https://www.youtube.com/watch?v=DjV_O6mCW0Y
Unit 4 Day 7 Applications of System of Equations: https://www.youtube.com/watch?v=Z2nZWC_E774
