Mathematics for IGCSE & O level - Equations (Section 8 - No. 19)

Which of the following is a key step in solving a system of equations using the elimination method?

Multiplying one or both equations by a constant to make the coefficients of one variable opposites.

Setting the two equations equal to each other.

Substituting one equation into another.

Graphing the equations.

Elimination involves manipulating equations to eliminate one variable by canceling terms.