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The line (y=(t-12)x+(4t-3)) has slope (6). What is its (y)-intercept?

Answer and explanation

Correct answer: 69

A line in the form y = mx + c has slope equal to the coefficient of x. Thus, t - 12 = 6, so t = 18. The y-intercept is 4t - 3 = 4(18) - 3 = 69. Therefore, the correct answer is 69. The value 68 would result from incorrectly using 4t - 4 as the constant term. Exam tip: first find the parameter from the slope, then substitute it into the constant term to obtain the y-intercept.

Related tags

Linear EquationsSlopeY-InterceptParameterCoordinate GeometrySlope And Y InterceptIntroduction To PolynomialsMathematics

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