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Find k, if R (1, -1), S (-2, k) and slope of line RS is -2. |
Answer» R(x1 , y1 ) = R (1, -1), S (x2 , y2 ) = S (-2, k) Here, x1 = 1, x2 = -2, y1 = -1, y2 = k Slope of lines RS = (y2 - y1)/(x2 - x1) = (k - (-1))/(-2 - 1) = (k + 1)/-3 But, slope of line RS is -2. … [Given] ∴ -2 = (k + 1)/-3 ∴ k + 1 = 6 ∴ k = 6 – 1 ∴ k = 5 |
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