step 1
Find out the slope of the trend line
we need two points
(x1,y1) and (x2,y2)
substitute in the formula of slope
[tex]m=\frac{(y_2-y_1)}{(x_2-x_1)}[/tex]step 2
Looking at the graph
Find out the initial value or y-intercept (value of y when the value of x=0)
the y-intercept is the ordered pair (0,b)
step 3
Find out the equation of the line in slope-intercept form
y=mx+b
substitute the value of m and b
to obtain the equation of the trend line
