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If (y=21+7x), which value of (x) gives (y=77)?

Answer and explanation

Correct answer: 8

Given \(y=21+7x\) and \(y=77\), we get \(21+7x=77\). Thus, \(7x=56\), so \(x=8\). Therefore, 8 is the correct option. For instance, if \(x=7\), then \(y=70\), not 77. In exams, substitute the given value of \(y\) into the equation and solve for \(x\).

Related tags

Linear EquationSubstitutionSolve For XPolynomialsAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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