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If (x-y=5) and (2x+3y=30), what is the solution?

Answer and explanation

Correct answer: (9, 4)

This pair is solved conveniently by substitution. From x-y=5, we obtain x=y+5. Substituting this value of x into the second equation gives 2(y+5)+3y=30. On simplifying, 2y+10+3y=30, so 5y=20 and y=4. Therefore x=y+5=9. The ordered pair is (9,4), so option B is correct. Option A, (8,3), gives x-y=5 but produces 25 rather than 30 in the second equation. Option C gives x-y=5 but also fails the second equation, while option D does not even satisfy the first equation because 10-5=5 but 20+15=35. Checking both original equations confirms the answer.

Related tags

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

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