exam Maths Puzzle Numerical Ability

How do you get the answer to 2x+7y=3
x=1-4y

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Help please. I have such trouble with word problems.
Soybean meal is 18% protein. Cornmeal is 9% protein. How many pounds of each should be mixed together in order to get 360 lb. mixture that is 16% protein.
Thanks for any help at all. 2. The break even values for a profit model are the values for which you earn $0 in profit. Use the equation you created in question one to solve P = 0, and find your break even va