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If (y=(k+2)x-4) and (y=3x+(k-1)) have the same (y)-intercept, what is (k)?

Answer and explanation

Correct answer: \(-3\)

In the form \(y=mx+c\), the constant term \(c\) is the \(y\)-intercept. The first line has \(y\)-intercept \(-4\), while the second has \(k-1\). For equal intercepts, \(k-1=-4\), so \(k=-3\). If \(-2\) were used, the second intercept would be \(-3\), not \(-4\). Exam tip: set \(x=0\) to identify a \(y\)-intercept.

Related tags

Y-InterceptLinear EquationsParameterCoordinate GeometryAlgebraSlope And Y InterceptIntroduction To PolynomialsMathematics

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