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The line (y=(2r-5)x+(r+1)) passes through the origin. What is (r)?

Answer and explanation

Correct answer: -1

A line has the form y=mx+c, where c is its y-intercept. For the line to pass through the origin (0,0), its y-intercept must be 0. Hence, r+1=0, so r=-1. For example, if r=1, the y-intercept is 2, so that option is incorrect. Exam tip: In questions involving the origin, directly substitute x=0 and y=0.

Related tags

Linear EquationsSlopeY-InterceptOriginParameterCoordinate GeometrySlope And Y InterceptIntroduction To Polynomials

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