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Under which condition will the two non-vertical lines \(y=m_1x+c_1\) and \(y=m_2x+c_2\) intersect the y-axis at the same point?

Answer and explanation

Correct answer: \(c_1=c_2\)

In \(y=mx+c\), putting \(x=0\) gives \(y=c\), so the y-axis point is \((0,c)\). Therefore, both lines have the same y-intercept only when \(c_1=c_2\). \(m_1=m_2\) indicates equal slopes, usually parallel lines. Exam tip: set \(x=0\) to identify a y-intercept.

Related tags

Linear EquationsSlopeY-InterceptCoordinate GeometryConceptual MathematicsSlope And Y InterceptIntroduction To PolynomialsMathematics

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