exam Maths Puzzle Numerical Ability

-7x+y=20
9x-3y=36

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exam Other Question

which of the ordered pairs
(-9,3), (6,0), (-4,-2),(-19,5)
are solutions for the equation x+5y=6 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.