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If (y=(m+2)x-8) and (y=9x+(m-12)) have the same (y)-intercept, what is (m)?

Answer and explanation

Correct answer: 4

In the form \(y=ax+b\), the \(y\)-intercept is the constant term \(b\). The first line has y-intercept \(-8\), while the second has y-intercept \(m-12\). For equal intercepts, \(m-12=-8\), so \(m=4\). The term \(m+2\) belongs to the slope, not the intercept. Exam tip: put \(x=0\) to find a y-intercept.

Related tags

Y-InterceptLinear EquationsCoordinate GeometryParameterAlgebraSlope And Y InterceptIntroduction To PolynomialsMathematics

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