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If (y=18+4x), which value of (x) makes (y) equal to (7x)?

Answer and explanation

Correct answer: \(x=6\)

We need both \(y=18+4x\) and \(y=7x\). Therefore, \(18+4x=7x\). Subtracting \(4x\) from both sides gives \(18=3x\), so \(x=6\). Check: for \(x=6\), \(y=18+24=42\) and \(7x=42\). For \(x=5\), the two values are 38 and 35, so it is not correct. Exam tip: equate the two expressions for y first, then solve for x.

Related tags

Linear EquationsPolynomialsSolve For XSubstitutionAlgebraic ExpressionsLinear Growth And DecayIntroduction To PolynomialsMathematics

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