1考点与命题1.1客观题考点分析1.1.1直线方程的考查,一般以直线与曲线(特别是圆)的位置关系为载体,考查求直线的倾斜角、斜率、截距或其取值范围,求直线的方程等.例1(辽宁卷Ⅰ(9))若直线2x-y+c=0按向量a=(1,-1)平移后与圆x2+y2=5相切,则c的值为()(A)8或-2.(B)6或-4.(C)4或-6.(D 1 test sites and propositions 1.1 objective test sites analysis 1.1.1 linear equations of the test, generally based on the positional relationship between the straight line and the curve (especially the circle) as a carrier, examine the straight line tilt angle, slope, intercept or its range of values, Find the equation of the line, etc. Example 1 (Liaoning Volume I (9)) If the straight line 2x-y+c=0 is translated by the vector a=(1,-1) and the circle x2+y2=5, then c The value is ()(A)8 or -2.(B)6 or -4.(C)4 or -6.(D