Normally, if I tell you 3x + 4y = 6, and 9x + 6y = 14, you know how to solve it.

一般来说,如果我给你两个方程 3x + 4y = 6,和 9x + 6y = 14,你们肯定会解

耶鲁公开课 - 基础物理课程节选

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

Now, we are done because now we can ask how high does it go, and you go back to your y of 1 is 15+10-5, which is what?

现在问题解决了,因为我们可以算出,最高点的高度,你回到这个式子,求出y=15+10-5,是多少

耶鲁公开课 - 基础物理课程节选