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If (y=(r+8)x+(r-4)) passes through the origin, what will be its slope?

Answer and explanation

Correct answer: \(12\)

A line has the form \(y=mx+c\), where \(c\) is the y-intercept. Here, \(c=r-4\). Since the line passes through the origin \((0,0)\), its y-intercept must be zero. Thus, \(r-4=0\), so \(r=4\). Therefore, the slope is \(m=r+8=4+8=12\). The value \(8\) is only part of the coefficient; it is not the slope until \(r\) is found. Exam tip: for a line through the origin, set the constant term equal to zero.

Related tags

Linear EquationsSlopeY-InterceptOriginParameterCoordinate GeometrySlope And Y InterceptIntroduction To Polynomials

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