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If (y=(a+7)x+(a-12)) passes through the origin, what will be its slope?

Answer and explanation

Correct answer: \(19\)

The equation of the line is \(y=(a+7)x+(a-12)\). Since it passes through the origin \((0,0)\), substitute \(x=0\) and \(y=0\) to get \(a-12=0\), so \(a=12\). Hence, the slope, the coefficient of \(x\), is \(a+7=12+7=19\). Option \(18\) is a close distractor, but it does not result from substituting the correct value of \(a\). Exam tip: in \(y=mx+c\), \(m\) is the slope and \(c\) is the y-intercept.

Related tags

Linear EquationsSlopeY-InterceptOriginParameterCoordinate GeometrySlope And Y InterceptIntroduction To Polynomials

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