exam Maths Puzzle Numerical Ability

decide wether the relation is a function. if it is a function give the domain and the range.

0 6, -6

1 5, -5

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I need help with this homework problem:
t+22/t square-t-72 + 8/t-9 = 4/t+8

Thank you. Solve: x+6/3-x-6/5=2