it’s kinda hard to read soo

A lake near The Arctic Circle is covered by a thick sheet of ice during the cold winter months. When spring arrives, the warm air gradually melts the ice, causing it’s thickness to decrease at a rate of 0.2m per week. After 7 weeks, the sheet is only 2.4m thick.

Let y represent the ice sheets thickness (in meters) after x weeks.

Complete the equation for the relationship between the thickness a number of weeks.