In a certain code language, '587' is written as 'see good pictures', '539' is written as 'good and beautiful', and '967' is written as 'pictures are beautiful'. What is the code for the word 'see' in that language?

8

Given; In a certain code language, '587' is written as 'see good pictures', '539' is written as 'good and beautiful', and '967' is written as 'pictures are beautiful'. 

So,

5   8   7  =  see  good  pictures

5   3   9  =  good  and  beautiful

9   6   7  =  pictures  are  beautiful

Thus,

Code for good is 5, pictures is 7, beautiful is 9, see is 8, and is 3 and are is 6