1.

Find k, if PQ || RS and P (2, 4), Q (3, 6), R (3,1), S (5, k).

Answer»

Slope of line PQ = (y2 -y1)/(x2 - x1) = (6 -4)/(3 - 2) = 2

Slope of line RS = (y2 -y1)/(x2 - x1) = (k - 1)/(5 - 3) = (k -1)/2

But, line PQ || line RS … [Given] 

∴ Slope of line PQ = Slope of line RS 

∴ 2 = (k -1)/2

∴ 4 = k – 1 

∴ k = 4 + 1 

∴ k = 5



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