帮忙做3道英文数学题1.Find the equation of straight line passes throug

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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

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