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If p(x) = 260 - 15x and q(x) = 68 + 3x, what is x when p(x) = q(x)?

Answer and explanation

Correct answer: x = 32/3

The governing concept is solving a linear equation by setting two linear expressions equal. Since p(x)=q(x), write 260−15x = 68+3x. Subtracting 68 gives 192−15x=3x. Adding 15x to both sides gives 192=18x, and division by 18 gives x=192/18=32/3, approximately 10.67. Therefore option D is correct. A quick check confirms the result: at x=32/3, both expressions have the same value. The integer choices 8, 9, and 10 do not satisfy the equality; for example, at x=10, p(x)=110 while q(x)=98. The negative coefficient affects the algebra but does not change the method.

Related tags

Linear EquationEqualityLinear ExpressionLinear Growth And DecayIntroduction To PolynomialsMathematicsClass 9 Mcq

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