How we solve the ncert exercise 7.4 class 10th coordinate geometry. please give me the best and easy solution of the question. Determine the ratio in which the line 2x + y – 4 = 0 divides the line segment joining the points A(2, –2) and B(3, 7)
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Determine the ratio in which the line 2x + y – 4 = 0 divides the line segment joining the points A(2, –2) and B(3, 7) Q.1
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Consider line 2x + y – 4 = 0 divides line AB joined by the two points A(2, -2) and B(3, 7) in k : 1 ratio.
Coordinates of point of division can be given as follows:
x = (2 + 3k)/(k + 1) and y = (-2 + 7k)/(k + 1)
Substituting the values of x and y given equation, i.e. 2x + y – 4 = 0, we have
2{(2 + 3k)/(k + 1)} + {(-2 + 7k)/(k + 1)} – 4 = 0
(4 + 6k)/(k + 1) + (-2 + 7k)/(k + 1) = 4
4 + 6k – 2 + 7k = 4(k+1)
-2 + 9k = 0
Or k = 2/9
Hence, the ratio is 2: 9.