Optimization problem

Question

legomyego180 · Answer

Actually, its stationary point, sort of the same idea.
A classmate posted her notes on how to work a problem but im confused with the system of equations.

Here are her notes

legomyego180 · Answer

how does -2(2x)+x=4x?

zepdrix · Answer

Haha good catch XD That definitely looks wrong.

-3x = -8

legomyego180 · Answer

thanks zep! I thought maybe i was missing something

legomyego180 · Answer

@zepdrix wait I must be missing something, this guy did the same thing on his

zepdrix · Answer

Hmm why they do that :\

zepdrix · Answer

Oh.. look at all the options...
There is no (2,-1) option, right?

legomyego180 · Answer

i asked them directly in our group chat

legomyego180 · Answer

yea, she said she got a 100 on her quiz though. The answer was none of the above apparently

zepdrix · Answer

Hmm

legomyego180 · Answer

I think we are right, im working through it and it seems like Im getting some good numbers.

zepdrix · Answer

Ya I think these bozos got the question right by accident.

legomyego180 · Answer

Yea, no idea how they managed that one haha. Oh well