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If the line (y=(k-6)x+5) increases (y) by (108) when (x) increases by (9), what is (k)?

Answer and explanation

Correct answer: 18

The slope of the line is (k-6). Since slope = change in y / change in x, (k-6)=108/9=12. Hence, (k=18). If 17 were chosen, the slope would be 11, so an increase of 9 in x would increase y by only 99, not 108. Exam tip: in a linear equation (y=mx+c), the constant c does not affect the rate of change; only m is the slope.

Related tags

Linear EquationsSlopeRate Of ChangeParameterCoordinate GeometrySlope And Y InterceptIntroduction To PolynomialsMathematics

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