URGENT PLS HELP. Pls put why or why not as well thank you:))

Yes, the given relation is a function

Since it is obvious that the cost of nails varies according to the number of pounds of nails.

The cost cannot coincide with different number of pounds.

Say if a pounds cost x and b pounds cost y, then x cannot be equal to y untill a = b.

From this conclusion, we reach our decision that since each element of set input set will have a unique image in output set, the given relation is a function.

Remember that every function is a relation but every relation is not a function.