The fоllоwing tаble gives а depаrtment stоre's annual sales (in millions of dollars) from 2019 to 2023 with x = 0 corresponding to 2019. Year, x 0 1 2 3 4 Annual Sales, y 3.5 4.1 4.7 5.2 5.4 a) Plot the annual sales (y) versus the year (x) and draw a straight line, L, through the points corresponding to 2020 and 2022. b) Derive an equation for the line L.