The Relationshipsamong Linear Equations, Lines in the Coordinate Plane, and the Contexts TheyDescribe.

线性方程组可以通过坐标平面中的对应的线条来解决问题。

youdao

And, in terms of a graph, they correspond to slicing by a plane that's parallel to one of the coordinate planes, so that we either keep x constant, or keep y constant.

从图像上看，它们对应于,用平行于坐标轴的平面横截图像得到的，过程中保持x或y恒定。

youdao

So the idea of spherical coordinate is you're going to polar coordinates again in the rz plane.

所以说球坐标系,其实就是在rz平面再建立一个极坐标。

youdao

We have already authorized all of our resources to coordinate with the French in trying to discover where the plane went down and to find as much information as possible.

WHITEHOUSE: THE WHITE HOUSE

Before Galileo began running balls down an inclined plane to measure changes in velocity, and before Descartes developed his coordinate system, the German Jesuit Christoph Clavius, designed the mathematics curriculum for the major universities of Europe.

FORBES: A Long Forgotten Father of the Scientific Revolution