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42. Find the ratio in which the line x - 3y = 0 divides the line segment joining thepoints (-2,-5) and (6, 3). Find the co-ordinates of the point of intersection.HOTS |
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Answer» Solution :- Let us assume that, the given line x - 3Y = 0 intersect the line segment JOINING A(-2, -5) and B(6, 3) in the ratio k : 1 at point P(x,y). Now the section formula says that, the point which divides the line joining two points (a ,b) and (c , d) in the ratio m : n is :- P(x , y) = (cm + an)/(m + n) , (dm + bn)/(m + n) . So, Putting values now, we get :- → Coordinates of P(x, y) = (6k - 2)/(k+1), (3k - 5)/(k+1) Now, we have also given that, P lies on x - 3y = 0 . → x = 3y Or, → (6k - 2)/(k + 1) = 3{(3k - 5)/(k + 1)} (k + 1) will be cancel from both denominators,, → 6k - 2 = 9k - 15 → 9k - 6k = 15 - 2 → 3k = 13 → k = (13/3) Therefore, → Required Ratio = k : 1 = (13/3) : 1 = 13 : 3 Now, → Coordinates of P(x, y) = (6k - 2)/(k+1), (3k - 5)/(k+1) Putting VALUE of k = (13/3) , we get, → x = { 6*(13/3) - 2 } / (13/3 + 1) → x = ( 26 - 2 ) / {(13 + 3) / 3} → x = 24 * 3 / 16 → x = (3 * 3)/2 → x = (9/2) and, → y = { 3*(13/3) - 5 } / (13/3 + 1) → y = ( 13 - 5 ) / {(13 + 3) / 3} → y = 8 * 3 / 16 → y = (3/2) Hence, Coordinates of P are (9/2, 3/2) .Learn More :- PROVE that the mid point of the line joining points (-5,12) and (-1,12) is a point of trisection of the line joining the... in what ratio is tge line joining the points (9, 2) and (-3, - 2 ) divided by the y axis? also find the coordinate of th... find the equation of the straight line which passes through the point 4,3 and parallel to line 3x +4y=7 |
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