exam Maths Puzzle Numerical Ability

I need to know the rules for signed number arithmetic ie: when adding like signs..., unlike..., subtraction, multiplication, division... Thank you!

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exam Other Question

At johns cafe the cooks use 1/3 cup of gravy on each serving.How many servings can he make out of 12 cups? Graph 3x + 2y = 6

This one is throwing me off because the way I figured this one was 3x-2y = 1 or -1 to get rid of the variable to find the cordinance. Can someone please help me with this one. Thanks