scatter plot titled students' data, with points plotted at 1 comma 80, 2 comma 70, 2 comma 80, 2 comma 90, 3 comma 80, 3 comma 100, 4 comma 90, and 4 comma 98, and a line of fit drawn passing through the points 0 comma 70 and 1 comma 75

Determine the equation of the line of fit.

y = 5x + 70
y = 5x + 80
y = 10x + 70
y = 10x + 80