Algebraic solutions Student activity Play

Example of solving a system of linear equations by substitution Animation Play

Solving by substitution Student activity Play

Solving systems of linear equations Student activity Play

Solving systems of linear equations by Gaussian elimination Whiteboard exercise Play

Solving the system of equations Whiteboard exercise Play

Square of a sum – substituting into a formula Student activity Play

Square of a sum – substituting into a formula Whiteboard exercise Play

Substituting into a formula Animation Play