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If (y=9x+b) and (y=-7x+15) cut the (y)-axis at the same point, what is (b)?

Answer and explanation

Correct answer: \(15\)

In the form \(y=mx+c\), the \(y\)-intercept is \(c\), because \(x=0\) on the \(y\)-axis. The first line has \(y\)-intercept \(b\), while the second has \(y\)-intercept \(15\). Since they meet the \(y\)-axis at the same point, \(b=15\). The number \(9\) is the slope of the first line, not its intercept. Exam tip: in \(y=mx+c\), identify \(c\) directly as the \(y\)-intercept.

Related tags

Y-InterceptLinear EquationsSlopeCoordinate GeometryParametersSlope And Y InterceptIntroduction To PolynomialsMathematics

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