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What are the y-intercept and slope in 6x + 7y - 42 = 0?

Answer and explanation

Correct answer: y-intercept 6, slope -6/7

The governing concept is y = mx + c, in which m is the slope and c is the y-intercept. Rearrange 6x + 7y - 42 = 0 by moving 6x and -42 to the other side: 7y = -6x + 42. Divide every term by 7 to obtain y = (-6/7)x + 6. Thus the slope is -6/7 and the y-intercept is 6, so option A is correct. Option B reverses both signs. Option C reads the original constant and coefficient as the answers without isolating y, and option D similarly mistakes the coefficient of y for the slope. Setting x = 0 in the original equation gives 7y - 42 = 0, hence y = 6, which confirms the intercept directly.

Related tags

SlopeY-InterceptSlope-Intercept-FormLinear-EquationsSlope And Y InterceptIntroduction To PolynomialsMathematicsClass 9 Mcq

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