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Which equation should be multiplied by (3) to eliminate (y) with (2x-3y=7)?

Answer and explanation

Correct answer: \(x+y=5\)

Multiplying \(x+y=5\) by 3 gives \(3x+3y=15\). On adding it to \(2x-3y=7\), the terms \(+3y\) and \(-3y\) cancel, so \(y\) is eliminated. Multiplying \(x-y=5\) by 3 gives \(-3y\), which would not cancel the given \(-3y\) on addition. Exam tip: for elimination by addition, the selected variable must have equal coefficients with opposite signs.

Related tags

Linear EquationsElimination MethodVariable EliminationAlgebraic MethodsClass 10 MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Var

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