exam Maths Puzzle Numerical Ability

which of the following are functions? explain your reasoning.

f(x)=10/x

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exam Other Question

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
Would you please answer 2(a-8)+7=5(a+2)-3a-19 please give the steps, thanks!