Which graph shows a function and its inverse?

Ok a point t on a segment with endpoints d(1, 4) and f(7, 1) partitions the segment in a 2: 1 ratio. find t. you must show all work to receive credit.

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

Which equation can be solved to find x the measure of jk in the apex