The slope of the line passing through the points (2,-1) and (x,5) is -1. Find x?
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 (2,-1) and (x,5) = -1
=> $$\frac{5+1}{x-2} = -1$$
=> $$\frac{6}{x-2}=-1$$
=> $$x-2=-6$$
=> $$x=2-6=-4$$
=> Ans - (B)
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