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If y = 2x + 3 and 5x − 2y = 1, what is the value of x?

Answer and explanation

Correct answer: 7

Substitution is the most direct method because the first equation already expresses y in terms of x. Replace y in the second equation by 2x + 3: 5x - 2(2x + 3) = 1. Carefully distributing -2 gives 5x - 4x - 6 = 1, so x - 6 = 1 and x = 7. To verify, substitute x = 7 into the first equation: y = 2(7)+3 = 17. The second equation then becomes 5(7)-2(17)=35-34=1, exactly as required. Therefore option C is correct. The other choices can arise from a sign error while expanding -2(2x+3), but they fail the original system.

Related tags

Substitution-MethodLinear-EquationsAlgebraic-SimplificationAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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