U4L1 Number Puzzles

U4L2 Keeping the Equation Balanced

U4L3 Balanced Moves

U4L4 More Balanced Moves

U4L5 Solving Any Linear Equation

U4L6 Strategic Solving

U4L7 All, Some, or No Solutions

U4L8 How Many Solutions?

U4L9 When Are They the Same?

U4L10 On or Off the Line?

U4L11 On Both of the Lines

U4L12 Systems of Equations

U4L13 Solving Systems of Equations

U4L14 Solving More Systems

U4L15 Writing Systems of Equations

U4L16 Solving Problems with Systems of Equations