求一次函数图象平移后的解析式是一类常见的题型.可以根据平移前后点的坐标的变化关系来解决问题.我们知道,y=kx+b的图象经过点(0,b),而(0,b)向上平移m个单位后得到点(0,b+m),向下平移m个单位后得到点(0,b-m),向左平移m个单位后得到点(-m,b),向右平移m个单位后得到点(m,b).图象平移后斜率不变,仍然是k.可以设平移后的图象的 It is a common type of problem to find a transformable analytic function image, and we can solve the problem according to the change of coordinate before and after translation. We know that the image of y = kx + b passes through point (0, b) (0, b + m), then point (0, bm) is obtained by shifting m units downward and (m) is obtained by shifting m units to the left , b), the right to shift m units to get the point (m, b) after the image shift the same slope, still k can be set after the shift of the image