同学们知道,在平面直角坐标系中,直线y=kx向上或向下平移n个单位长度,就得到直线y=kx+b+n或y=kx+b-n(k、b为常数且k≠0,n>0)。其实,当k>0时,直线沿y轴向上或向下平移,相当于该直线沿x轴向左或向右平移;当k<0时,直线沿y轴向上或向下平移,相当于该直线沿x轴向右或向左平移;那么,当给出一条直线向左或向右平移n个单位长度时,你还能很快求出该直线的解析式吗?我们先不妨以直线y=2x+3为例来探索 Students know that in a Cartesian coordinate system, a straight line y = kx is translated by n units of length up or down to obtain a straight line y = kx + b + n or y = kx + bn (where k is a constant and k ≠ 0, n> 0). In fact, when k> 0, the straight line moves upward or downward along the y axis, corresponding to the straight line is translated to the left or right along the x axis. When k <0, the straight line translates up and down along the y axis, Equivalent to the straight line along the x-axis to the right or left translation; then, when given a straight line to the left or right translation n unit length, you can quickly find the analytical solution of the line? Take the straight line y = 2x + 3 as an example to explore