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If (y=5x+(v-9)) and (y=(v+4)x+8) have the same (y)-intercept, what is the slope of the second line?

Answer and explanation

Correct answer: 21

In the form \(y=mx+c\), \(c\) is the \(y\)-intercept. Since the two lines have the same \(y\)-intercept, \(v-9=8\). Thus, \(v=17\). The slope of the second line \(y=(v+4)x+8\) is \(v+4=17+4=21\). The value 19 would be \(v+2\), not the required slope. Exam tip: in \(y=mx+c\), the coefficient of \(x\) is the slope.

Related tags

Linear EquationsSlopeY-InterceptCoordinate GeometryParametersSlope And Y InterceptIntroduction To PolynomialsMathematics

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