Mathematics for IGCSE & O level - Equations (Section 5 - No. 24)

Identify the step(s) required to eliminate a variable when solving a system of equations.

Add the equations directly, if coefficients are opposite.

Subtract one equation from another, if coefficients are the same.

Multiply one or both equations by a constant to make coefficients the same or opposites.

Isolate a variable in one equation and substitute.

All strategies are ways to eliminate a variable.