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The line (y=(t-10)x+(3t-1)) has slope (5). What is its (y)-intercept?

Answer and explanation

Correct answer: 44

A line in the form y = mx + c has slope m, the coefficient of x. Here, the slope is t - 10. So, t - 10 = 5, giving t = 15. Therefore, the y-intercept is 3t - 1 = 3(15) - 1 = 44. Getting 43 would result from an arithmetic error in the final subtraction. Exam tip: first find the parameter using the slope, then substitute it into the constant term.

Related tags

Linear EquationsSlopeY-InterceptParameterCoordinate GeometrySlope And Y InterceptIntroduction To PolynomialsMathematics

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