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In which of the following pairs of linear equations will y be eliminated directly on adding the two equations, without multiplying either equation?

Answer and explanation

Correct answer: \(2x+3y=10,\; 5x-3y=4\)

In option A, the coefficients of y are 3 and -3. Therefore, on adding the equations, \(3y+(-3y)=0\), so y is eliminated. In option B, adding eliminates x instead, while in option C the y-coefficients are 4 and -2, so y does not cancel directly. Exam tip: For elimination by addition, look for equal coefficients with opposite signs for the variable to be removed.

Related tags

Linear EquationsElimination MethodAlgebraic MethodsClass 10 MathematicsCoefficient ComparisonAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two V

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