exam Maths Puzzle Numerical Ability

Find each product. #58

(3y - 13)(y - 3)

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exam Other Question

Hello,
I am having a hard time finding domains. For example:
f(x) = 1/x-2? This makes no sense to me. Please help.
Solve each of the following systems by substitution.
McGraw Hill 6th edition, 8.3 # 28.
Thank you so very much for your time!!!!

4x-12y=5
-x+3y=-1