Khan Academy Algebraically determining segment length 535 03:18

Khan Academy Systems word problems 563 08:01

Khan Academy Systems word problems 525 04:14

Khan Academy Systems word problems 504 02:11

Khan Academy Solving systems with substitution 512 04:05

Khan Academy Solving systems with substitution 537 03:43

Khan Academy Solving equations with distribution 553 01:54

Khan Academy Solving equations with distribution 543 03:23