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What are the signs of the slope and y-intercept in the line y = -7x + 9?

Answer and explanation

Correct answer: Slope negative and y-intercept positive

Use the standard slope-intercept form y = mx + c. Comparing y = -7x + 9 with this form gives m = -7 and c = 9. Because the coefficient of x is negative, the slope is negative and the line falls as x increases. Because the constant term is positive, the y-intercept is positive; in fact, the line crosses the y-axis at (0, 9). Therefore option B is correct. Option A incorrectly treats -7 as positive, option C reverses the signs of both quantities, and option D is impossible because neither -7 nor 9 is zero. Reading the x coefficient and constant term separately prevents the usual sign error.

Related tags

Negative SlopePositive InterceptSign AnalysisLinear EquationsSlope And Y InterceptIntroduction To PolynomialsMathematicsClass 9 Mcq

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