What is the solution to the inequality

Is each relation a function? if so, state whether it is one-to-one or many-to-one. 3. (-4,7), (-3,5), (1,4), (3,-8), (5,-11) 4. (-4,8), (-2,4), (0,1), (2,4), (4,8) 5. (-2, 1), (-2,3), (0,-3), (1,4), (3,1)

Can any one me with the answers to these questions asap?

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.