Ted practices two types of swimming styles for a total of 50 minutes every day. he practised the breaststroke 20 minutes more than he practices the butterfly stroke.

part a: write a pair of linear equations to show the relationship between the number of minutes ted practices the butterfly stroke every day (x) and the number of minutes he practised the breaststroke every day (y). (5 points)

part b: how much time does ted spend on practising the breaststroke every day? (3 points)

part c: is it possible for ted to have spent 45 minutes practising the butterfly stroke every day? explain your reasoning. (2