1. The slope of the line passing through the points (7,-2) and (x,1) is -3/10. Find x.
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By: anil on 05 May 2019 02.11 am
Slope of line passing through $$(x_1,y_1)$$ and $$(x_2,y_2)$$ is $$frac{y_2 - y_1}{x_2 - x_1}$$ => Slope of the line passing through the points (7,-2) and (x,1) = $$frac{1 + 2}{x - 7} = frac{-3}{10}$$ => $$frac{3}{x - 7} = frac{-3}{10}$$ => $$x - 7 = -10$$ => $$x = -10 + 7 = -3$$ => Ans - (D)
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