help with assignment ?

Question

anonymous · Answer

only #4 and 5

anonymous · Answer

@phi @hartnn

phi · Answer

any guess what info you need (in addition to what they told you already)  to answer question (4) ?

anonymous · Answer

we need 2 linear equations right

phi · Answer

yes, based on the kinds of questions being asked.  But what info did they leave out of the question ?

phi · Answer

they want to know how many of each type of weapon to bring on board, *and use all the batteries*

phi · Answer

we can figure out how many batteries  "x number" of ray guns use if we know how many batteries 1 ray gun uses.  
what about the missiles ?

anonymous · Answer

nothing, that is it. #3 doesn't have anything to do with #4 i think.

anonymous · Answer

i think all we have to do is explain how and what info we need

anonymous · Answer

@mathmale

anonymous · Answer

i will open a new question so its clearer

mathmale · Answer

At first glance, Problem #4 strikes me as involving linear algebra.  You're right; it has no connection whatsoever to #3.

Have you graphed systems of inequalities such as 
5x - 4y equal to or less than 20
3x  + y  equal to or greater than 7

??