What is equivalent to 6 to the 4th power to the negative 1 power

Karianne and lucius are analyzing a linear function on a graph. karianne says that unit rate is equal to rate of change, but that slope is calculated differently. lucius says that unit rate, rate of change, and slope are calculated the same way. who is correct? explain your answer.

How do you use the elimination method for this question? explain, because i really want to understand!

Can someone me and plz do the problem