Expert: Richard J. Raridon - 6/1/2009

Question
QUESTION: I have no idea how to do equations they blow my mind i can keep order of operation together i have a test in the am on liner equation with graphing elimation and sub. help please explain step by step or give me a website that will explain on my level I am a college student and graduated one time I just don't grasp the consept. thanks

ANSWER: Send me a couple of problems and I'll show you how to do them.

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QUESTION: Tim and tom mix 2 kinds of feed for dog food they wish to make 22 pounds of feed worth .44 per pound by mixing one kind worth .22 per pound with another worth .50 per pound how many pounds of the cheaper kind should they use in the mix round to the nearest whole number.
2- x+4y= 44
-4+2y=4      I have to use the graphing method and substitution and elimination on all kinds of problems but I don't understand or grasp the concept put this here eliminate this move here it is too complicated for me.  Thanks

Answer
That's an easy problem.
Let x = lb. of 0.22/lb feed and y = lb. of 0.50/lb feed
x+y = 22 and 0.22x+0.50y = 22(0.44)
So you substitute from the 1st. eq. into the 2nd to get
0.22x +0.50(22-x) = 9.68 so x = 4.7 lb or 5 (rounded to the nearest whole number)