The function y - 68 = 12(x-4) can be used to determine the cost in dollars for renting a canoe for x house. What is the rate of change of the cost in dollars with respect to the number on hours.

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.