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Maths help please (degree)

This is mathematical economics, although it seems pretty pure, so hopefully someone can help me. Here is the question:

Thanks
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Original post by Alex-Torres

Thanks


What have you done and where are you stuck?
Original post by ghostwalker
What have you done and where are you stuck?

I made y1 the subject of the first equation and then assumed everything other than x1 was a constant (to find dy1/dx1) but I know that this is probably wrong. Apart from this, I have no idea what to do.
Original post by Alex-Torres
I made y1 the subject of the first equation and then assumed everything other than x1 was a constant (to find dy1/dx1) but I know that this is probably wrong. Apart from this, I have no idea what to do.
Kind of the right idea, but you can't assume that y2 is a constant.

Spoiler

Original post by DFranklin
Kind of the right idea, but you can't assume that y2 is a constant.

Spoiler


Why can't you assume y2 is a constant?
Original post by Alex-Torres
Why can't you assume y2 is a constant?


Because y1 is a function of x1 and x2. And similarly y2.
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Avatar for TeeEm
TeeEm
19
Original post by Alex-Torres
Why can't you assume y2 is a constant?


a little suggestion for this question

write

y1 = u, u = u(x,y) where x=x1 and y=x2
y2 = v, v = v(x,y) where x=x1 and y=x2

it might help you see better

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