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On solving (10x-3y=61) and (2x+3y=23), what is (y)?

Answer and explanation

Correct answer: y = 3

Adding the two equations eliminates y because −3y and +3y cancel: 12x = 84, so x = 7. Substituting x = 7 into 2x + 3y = 23 gives 14 + 3y = 23, hence 3y = 9 and y = 3. Therefore, option B is correct. Verification gives 10(7) − 3(3) = 61 and 2(7) + 3(3) = 23. Exam tip: When the coefficients of one variable are equal in magnitude and have opposite signs, add the equations to eliminate that variable directly.

Related tags

Linear EquationsElimination MethodSubstitution MethodValue Of YClass 10 MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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