exam Maths Puzzle Numerical Ability

instuctions-solve each system by the graphing method.

this makes no sense and the problem is stright out of the book

y=x
y=6-x

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exam Other Question

Is the following a perfect trinomial:
x^2 + 18x + 81
Thank you for the help, these always confuse me!
which of the following are functions? explain your reasoning.

f(x)=10/x