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If (x=2y-4) and (x+y=14), which is the correct solution?

Answer and explanation

Correct answer: (x=8,\ y=6)

The two conditions are \\(x=2y-4\\) and \\(x+y=14\\). Substitute the expression for x into the second equation: \\((2y-4)+y=14\\). Combining like terms gives \\(3y-4=14\\), so \\(3y=18\\) and \\(y=6\\). Now use the first relation: \\(x=2(6)-4=12-4=8\\). Hence the solution is \\((x,y)=(8,6)\\), option A.

Both original statements verify the result. The first gives \\(2(6)-4=8\\), and the second gives \\(8+6=14\\). The other options either do not satisfy the formula for x or do not make the sum 14. It is important to substitute the given expression exactly and then solve the resulting one-variable equation. Therefore the supplied answer A is correct and unambiguous.

Related tags

Linear EquationsSubstitutionSolution PairEasyClass 10

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