x*y=3 And lambda x - 2y = 0. And xy = 3.
和λx-2y=0和。
How did I get this negative 2x and negative 2y?
我是怎么得到-2x和- 2y的？
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。
OK, so the equation is, well, 4x+2y-2z equals something, where something is, well, we should just plug in that point.
所以，方程就是4x+2y-2z=某个值，某个值就是，我们应该代入这个点。
So, let's say that we take still the same line up there, x+2y+4z=7 and let's consider the plane with the equation x+2y+4z = 7.
我们还是看之前的那条直线，同时考虑平面。
And, to go from one to the other, x+2y+4z Q1 If you're moving along any path from Q0 to Q1, 3 this thing will change continuously from 11 to 3.
,如果你从Q0沿任意一条路径移动到，值将连续地由11变到。
And, to go from one to the other, x+2y+4z Q1 If you're moving along any path from Q0 to Q1, 3 this thing will change continuously from 11 to 3.
,如果你从Q0沿任意一条路径移动到，值将连续地由11变到。
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