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If the line (y=(k-4)x+3) increases (y) by (56) when (x) increases by (7), what is (k)?

Answer and explanation

Correct answer: 12

The slope of the line is \,\(k-4\). Therefore, when \,\(x\) increases by 7, the change in \,\(y\) is \,\(7(k-4)\). Given \,\(7(k-4)=56\), we get \,\(k-4=8\) and hence \,\(k=12\). If 11 were chosen, the slope would be 7, giving a change of only 49 in \,\(y\) for a change of 7 in \,\(x\). Exam tip: In change-based line questions, first write \,\(\text{slope}=\frac{\Delta y}{\Delta x}\).

Related tags

Linear EquationsSlopeY-InterceptParameterRate Of ChangeAlgebraSlope And Y InterceptIntroduction To Polynomials

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