I want to use the linear version of a somewhat big equation which is outputted by my Mathematica code - For simplicity I will here use the example equation:
Test = 3 x + x y + 8 y
Now, I want to use only the first order term, so that for x that will be 3 and for y that will be 8. I have tried to get those using
Coefficient[Test, x]
Coefficient[Test, y]
However these give me for x:
3+y
and for y:
8+x
Is there anyway I can use Mathematica to ignore the terms that depend in both xy simultaneously?