直线方程问题是解析几何的基础部分,熟悉其常见考点尤为重要,下面例析几个常见考点,供大家参考.考点一、判断直线位置关系例1已知两直线l_1:x+m~2y+6=0,l_2:(m-2)x+3my+2m=0,求当m为何值时,l_1与l_2:(1)相交;(2)平行;(3)重合.解:当m=0时,l_1:x+6=0,l_2:x=0,l_1∥l_2.当m≠0时,化为斜截式方程:l_1:y=-1/m~2x- Linear equation problem is the basic part of analytic geometry, familiar with its common test sites is particularly important, the following analysis of several common test sites for your reference. Test sites a, to determine the relationship between the linear position Example 1 Known two straight lines l_1: x + m ~ 2y + L = l, l_2: (m-2) x + 3my + 2m = 0, find the value of m when l_1 intersects with l_2: (1); (2) 0, l_1: x + 6 = 0, l_2: x = 0, l_1∥l_2. When m ≠ 0, it is a diagonal cutoff equation: l_1: y = -1 / m to 2x-