#y=2.2x+10# is the equation of the least squares regression line.
#residual = Y_ obs -Y_pred#, this is the formula we use to find the residual.
#y_obs# means the value of #y# that you found or observed from the scatter graph.
#Y_pred# means the value of #y# that you will find using the equation of the least squares regression line.
The point given is #(5,25)#
#x=5#
#y_obs = 25#
(Using equation)#Y _ pred = 2.2 ×5+10#
#=21#
Residual #= 25-21#
#= 4#