1 1.B

Think about solving problems:

10.∫3x+y-3 = 0//6x+my+ 1 = 0

∴3/ 1=6/m (same coefficient ratio)

∴m=2

∴ 6x+my+1= 6x+2m+1= 3x+y+1/2 = 0 (substitution simplification)

∵d=|c 1-c2|/√(a^2+b^2)=|-3- 1/2|/√(3^2+ 1^2)=(7/2)/√( 10)=(7/20)√ 10

1 1. The coordinates of the two centers are (0,0) and (4,3) respectively.

∴ distance d = 5；;

∫r 1 = 3，r2=4

∴|r 1-r2|<； d & lt|r 1+r2|

The intersection of two circles