x*y=3 And lambda x - 2y = 0. And xy = 3.

和λx-2y=0和。

youdao

How did I get this negative 2x and negative 2y?

我是怎么得到- 2x和- 2y的？

youdao

This maybe a -x + 2y and maybe a -z... oh, let me make that a -1.

x + 2y - z，哦，让我使它为- 1。

youdao

If I told you 3x + 2y = 9 and 4x + 6y = 6, you certainly know how to solve for x and y, right?

如果我给出 3x + 2y = 9,和 4x + 6y = 6 这两个方程,你们肯定知道怎么解出 x 和 y,对吧

耶鲁公开课 - 基础物理课程节选