book Maths Puzzle Numerical Ability

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.

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I need to know if I have this question right or not, In the ordered pair(12,-7) ? Is the the abscissa 12 and the ordinate -7? Please tell me if I am right or not, please. If you have a triangle and the points are set up in a matrix what do you times that matrix by to get the tringle to move 180 degrees on the point of origin