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What are the slope and (y)-intercept of the line (y=-9)?

Answer and explanation

Correct answer: Slope 0 and y-intercept -9

In the equation y = -9, the value of y remains constant for every value of x. Therefore, it is a horizontal line parallel to the x-axis, so its slope is 0. Putting x = 0 gives y = -9, hence the y-intercept is -9. Option B has the correct slope but the wrong sign for the y-intercept. Exam tip: every line of the form y = c has slope 0 and y-intercept c.

Related tags

SlopeY-InterceptHorizontal LineLinear EquationsCoordinate GeometrySlope And Y InterceptIntroduction To PolynomialsMathematics

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