plot graph for y = 1.55x +30 and y= 2.75x where y (£)as a function of the total number of swim x, for the option( member and non-member)what are the approx. coordinates and and what does it represent.
Perhaps those are equations for the cost (in £) of swimming at a pool, for members (with a 30 £ fixed membership charge) and nonmembers (who pay a higher cost per swim).
Someone should have told you what it represents.