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In 5x − 6y = 11 and 3x + 2y = 9, by what should the second equation be multiplied to eliminate y?

Answer and explanation

Correct answer: 3

The elimination principle requires the coefficients of the variable to be eliminated to have equal magnitudes and opposite signs. In the first equation, the coefficient of y is −6. In the second equation it is +2, so multiplying the entire second equation by 3 gives 9x + 6y = 27. The +6y then cancels the −6y when the equations are added, leaving an equation only in x. Therefore option D, 3, is correct. Multiplying by 1 leaves +2y, which cannot cancel −6y directly. Multiplying by 2 gives +4y, and multiplying by −2 gives −4y; neither produces the required +6y. The same multiplier must be applied to every term of the second equation.

Related tags

Linear-EquationsEliminationMultiplierClass-10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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