linear single-equation model

例句：

1. 1. The path is linear and easy tofollow.
   这条路线是直线的，很容易跟随。
2. 2. The data is linearly proportional tothe input.
   数据与输入成正比例关系。
3. 3.The model is linear in its assumptions.
   该模型在其假设上是线性的。