1.直线3x+y-5=0的斜率及在y轴上的截距分别是( )
A. | $3,-\frac{5}{3}$ | B. | 3,5 | C. | -3,-5 | D. | -3,5 |
20.已知点A(7,-4),B(-5,6)则线段AB垂直平分线方程是( )
A. | 6x-5y-1=0 | B. | 5x+6y+1=0 | C. | 6x+5y-1=0 | D. | 5x-6y-1=0 |
19.已知△AOB的顶点坐标分别是A(4,0),B(0,3),O(0,0)则△AOB外接圆的方程是( )
A. | x2+y2+4x-3y=0 | B. | x2+y2-4x-3y=0 | C. | x2+y2+4x+3y=0 | D. | x2+y2-4x+3y=0 |
18.过点(0,5)且在两坐标轴上截距之和为2的直线方程为( )
A. | 3x+5y+15=0 | B. | 5x+3y-15=0 | C. | 5x-3y+15=0 | D. | 3x-5y-15=0 |
17.两条直线x+y+1=0和x-y+1=0的交点坐标是( )
A. | (-1,0) | B. | (0,-1) | C. | (1,1) | D. | (-1,-1) |
16.两直线x+y-1=0,x+y+1=0的距离是( )
A. | 2 | B. | 1 | C. | 3 | D. | $\sqrt{2}$ |
15.点P(3,0)到直线3x+4y+1=0的距离是( )
A. | 2 | B. | 3 | C. | 4 | D. | 5 |
14.已知M(1,1)、N(3,3)则|MN|=( )
A. | 8 | B. | 4 | C. | $2\sqrt{2}$ | D. | 2 |
13.直线l过点(0,1),且倾斜角为450,则直线l的方程是( )
A. | x+y+1=0 | B. | x-y+1=0 | C. | x-y-1=0 | D. | x+y-1=0 |
12.已知A(1,2)、B(2,4)则线段AB的斜率是( )
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