两条直线2x + 3y-k = 0和x-ky + 12 = 0的交点在y轴上,那么k的值是
A -24 B 6 C ±6 D 24
过点P(2,3)且在两坐标轴有相等截距的直线方程是 ( ) A x + y-5 = 0 B x + y + 5 = 0
C x + y-5 = 0 或x + y + 5 = 0 D x + y-5 = 0 或3x-2y = 0
直线3x-4y-5 = 0和(x-1)2 + (y + 3)2 = 4位置关系是 ( )
A 相交但不过圆心 B 相交且过圆心 C 相切 D 相离
线3x + 4y + 2 = 0与圆x2 + y2 + 4x = 0交于A,B两点,则线段AB的垂直平分线的方程是 ( )
A 4x-3y-2 = 0 B 4x-3y-6 = 0
C 4x + 3y + 6 = 0 D 4x + 3y + 8 = 0
已知圆的方程为x2 + y2-4x + 6y = 0,下列是通过圆心直线的方程为
( )
A 3x + 2y + 1 = 0 B 3x-2y + 1= 0
C 3x-2y = 0 D 3x + 2y = 0
到点C(3,-2)的距离等于5的轨迹方程为 ( )
A (x-3)2 + (y + 2)2 = 5 B (x-3)2 + (y + 2)2 = 25
C (x + 3)2 + (y-2)2 = 5 D (x + 3)2 + (y-2)2 = 25