帮忙做3道英文数学题1.Find the equation of straight line passes throug
帮忙做3道英文数学题 1.Find the equation of straight line passes through the midpoint of the interval joining (6,2) and (-2,4).and the orgin. 2.the midpoint of an interval is (2.4). If the coordinates at the ends of the interval are (m,5) and (8,n). find m and n. 3.A and B are the points (-3,4) and (6,-2) respectively . If M is the midpoint of AB.Find the distance BM. 帮我做下这3个英文题吧...
1.the midpoint of the interval joining (6,2) and (-2,4) is (2,3) so if the line is y=kx 3=2k so k=1.5 the equation of the straight line is y=1.5x 2.so we can get m+8=2*2 5+n=4*2 thus m=-4 n=3 3.if M is the midpoint of AB so M:(1.5,1) and the distance BM= sqr[(6-1.5)^ +(-2-1)^] thus the answer is 5.4