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If (y=42+7x), which value of (x) makes (y) equal to (13x)?

Answer and explanation

Correct answer: \(x=7\)

Given \(y=42+7x\), the required condition is \(y=13x\). Therefore, \(42+7x=13x\). Subtracting \(7x\) from both sides gives \(42=6x\), so \(x=7\). Option \(x=6\) may seem close, but it gives \(y=84\) and \(13x=78\), which are not equal. Exam tip: First equate the two expressions, then collect like terms on one side.

Related tags

Linear EquationsPolynomialsSolve For XAlgebraic ExpressionsClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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