Which line has a constant of proportionality between y and x of 5/4?

How do i do this? i don’t understand

(c) the diagram shows the first three shapes of a matchsticks arrangement. first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid