book Maths Puzzle Numerical Ability

I am having trouble with my graphing and could really use some help, My question is In the ordered pair(12,-7)? Please can you help me?

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book Other Question

Either perform the indicated operation or solve the equation, whichever is appropriate.

4/a^2-1 + 1/2a + 2 PLEASE HELP ME WITH THIS PROBLEM: translate the quotient of a number and seven is two into an equation and solve