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If (C(x)=180-9x) and (D(x)=120-3x), when will both be equal?

Answer and explanation

Correct answer: \(x=10\)

For the two values to be equal, \(180-9x=120-3x\). Rearranging gives \(60=6x\), so \(x=10\). Hence, the correct option is \(x=10\). For example, at \(x=12\), \(C(x)=72\) and \(D(x)=84\), so they are not equal. Exam tip: equate the two expressions first, then collect variable terms on one side.

Related tags

Linear EquationsPolynomialsLinear DecaySolving EquationsEquality Of ExpressionsLinear Growth And DecayIntroduction To PolynomialsMathematics

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