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Choose the solution of (3x-4y=17) and (x+y=8).

Answer and explanation

Correct answer: (7, 1)

Use substitution from x+y=8, which gives x=8-y. Substituting into 3x-4y=17 produces 3(8-y)-4y=17. Thus 24-3y-4y=17, so 24-7y=17, -7y=-7, and y=1. Substitution back into x=8-y gives x=7. Hence the solution is (7,1), making option C correct. A quick verification is useful: 3(7)-4(1)=21-4=17 and 7+1=8, so both equations hold. Option A satisfies the second equation because 6+2=8, but its first-equation value is 18-8=10, not 17. Option B gives 15-12=3, and option D gives 12-16=-4; therefore these are distractors rather than solutions.

Related tags

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

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