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Which line has slope -3 and y-intercept 2?

Answer and explanation

Correct answer: y = -3x + 2

The governing concept is the slope-intercept form y = mx + c. In this form, m is the slope, which measures the change in y for a unit change in x, and c is the y-intercept, the value of y when x = 0. The required slope is -3, so the coefficient of x must be -3. The required y-intercept is 2, so the constant term must be +2. Substituting these values gives y = -3x + 2, which is option C. Option A has the correct intercept but a positive slope. Option B reverses the roles of the two numbers, making the slope 2 and the intercept -3. Option D has both an incorrect slope and an incorrect intercept, so it cannot represent the required line.

Related tags

SlopeY InterceptSlope Intercept FormSlope And Y InterceptIntroduction To PolynomialsMathematicsClass 9 Mcq

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