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What is the value of y from 7x + 2y = 32 and 3x − 4y = −6?

Answer and explanation

Correct answer: y = 69/17

Use elimination to remove y. Multiply 7x + 2y = 32 by 2, obtaining 14x + 4y = 64. Add the second equation, 3x − 4y = −6. The y terms cancel, so 17x = 58 and x = 58/17. Substitute this value into the first equation: 7(58/17) + 2y = 32. Writing 32 as 544/17 gives 406/17 + 2y = 544/17, so 2y = 138/17 and y = 69/17. Therefore option A is correct. Substitution in the second equation also works: 3(58/17) − 4(69/17) = (174 − 276)/17 = −102/17 = −6. The other fractions arise from arithmetic or sign errors.

Related tags

Linear EquationsElimination MethodFraction SolutionClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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