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प्रश्न
Find k, if R(1, –1), S (–2, k) and slope of line RS is –2.
उत्तर
Slope of line RS is –2
Slope of RS will be
\[\frac{y_2 - y_1}{x_2 - x_1} = \frac{k - \left( - 1 \right)}{- 2 - 1} = \frac{k + 1}{- 3} = - 2\]
\[ \Rightarrow k + 1 = 6\]
\[ \Rightarrow k = 5\]
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