book Maths Puzzle Numerical Ability

i am very confused on most things i think that i not only need a tutor for this, but a tutor in math also. i am really bad i think that i need lots of help.

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i understood most of the graphing but i dont understand how i would get the answer for y like in the graphing of
x-y-3 or x=3y I am inventing a new cookie recipe. I'd like the recipe to contain both walnuts and gourmet chocolate chip chunks. Walnuts sell for $3.00 per pound and gourmet chips sell for $1.