Practicing Success
If M(4, 5) is the mid-point of the line segment joining the points A(k, 4) and B(7, -3 p), then find the value of 2k + 3p. |
-4 -3 2 5 |
-4 |
Midpoints of two points with coordinates (x1 , y1) & (x2, y2) is (x , y ) :- ( x , y ) = ( \(\frac{x1 + x2 }{2}\) , \(\frac{y1 + y2 }{2}\) ) ( 4 , 5 ) = ( \(\frac{k + 7 }{2}\) , \(\frac{4 -3p }{2}\) ) \(\frac{k + 7 }{2}\) = 4 , \(\frac{4 -3p }{2}\) = 5 k = 1 , - 3p = 6 k = 1 , p = -2 Now , 2k + 3p = 2 × 1 + 3 ( - 2 ) = 2 - 6 = - 4 The correct answer is Option (1) → -4 |