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If m > 0 and c = 0 in y = mx + c, what is correct about the line?

Answer and explanation

Correct answer: The line increases and passes through the origin

The governing concept is the slope-intercept form y = mx + c. The coefficient m tells how y changes when x changes, while c gives the y-intercept. Since m > 0, a positive increase in x produces a positive change in y, so the line rises from left to right. Since c = 0, the equation becomes y = mx. Substituting x = 0 gives y = 0, so the line passes through (0, 0), the origin. Therefore option B correctly states both properties. Option A reverses the effect of the slope, option C would require m = 0, and option D is wrong because the y-intercept is zero, not negative.

Related tags

Positive SlopeOriginY-InterceptLinear EquationsSlope And Y InterceptIntroduction To PolynomialsMathematicsClass 9 Mcq

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