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May 30, 2015

Homework Help: Algebra II

Posted by Michael on Monday, November 17, 2008 at 9:20pm.

Farmer Fred can use two types of plant fertalizers, mix A and mix B. Type A contains 10 lbs of nitrogen, 8 lbs of phosphoric acid, and 9 lbs of potah in a cubic yard of each mix. Type B contains 5 lbs of nitrogen, 24 lbs of phosphoric acid and 6 lbs of potash in a cubic yard of each mix. Tests performed on the soil in a large field indicates that the field needs no more than 840 lbs of potash. The tests also indicate that at least 630 lbs of phosphoric acid and at least 350 lbs of nitrogen should be added to the field. A cubic yard of mix A costs $7 and a cubic yard of mix B costs $9. How many cubi yards of each mix should Farmer Fred add to the field in order to supply the necessary nutrients at minimal costs?

I need to graph this as a linear inequality and get the necessary equations! I have NO IDEA how to do this, and it's homework that's due tomorrow! PLEASE HELP!

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