Here, it means we integrate from y equals x to y equals 2x, x y So, let's draw y equals x. That seems to be here.
这里指的是从y=x到y=2x作积分，取0到1，我们应该先作图看看。，x，between，zero，and，one。，So，，we，should，draw，a，picture。,的下界是y=x，The，lower，bound，for，y，is，y，equals，x。,在这画出y=x的图像。
Ok, I'll start the same way, say maybe 2x-y and maybe I take no z... so this is 0.
好了，我将用同样的方法开始，假设，2x - y或许我不要z…得到0。
y=0 Let me rewrite the first two equations as 2x - lambda y = 0.
我把前2条写做2x-λ
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