1.

Find k, if B (k, -5), C (1, 2) and slope of the line is 7.

Answer»

B(x1 , y1 ) = B (k, -5), C (x2 , y2 ) = C (1, 2) 

Here, x1 = k, x2 = 1, y1 = -5, y2 = 2

Slope of line BC = (y2 - y1)/(x2 - x1) = (2 - (-5))/(1 - k)

= (2 +5)/(1 -k) = 7/(1 - k)

But, slope of line BC is 7. …[Given] 

∴ 7 = 7/(1 - k)

∴ 7(1 – k) = 7 

∴ 1 – k = 7/7

∴ 1 – k = 1 

∴ k = 0



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