A graph titled Federal Minimum Wage Results, from 1970 to 2005 every 5 years has years on the x-axis and minimum wage (dollars) on the y-axis. Points are at (1, 1.5), (2, 2), (3, 3), (4, 3.2), (5, 3.8), (6, 4.1), (7, 5), (8, 5).
The scatterplot shows the federal minimum wage rates in the United States, calculated every five years from 1970 (year 1 on the graph) to 2005 (year 8).

Which is the best equation of the trend line for the scatterplot?
y = –0.45x + 1.55
y = –0.45x – 1.55
y = 0.45x + 1.55
y = 0.45x – 1.55