In order to find the slope of the given line, use the following formula:
where (x1,y1) and (x2,y2) are any two points of the line.
In this case, use the coordinates of points A and B:
A(-3,1) = (x1,y1)
B(3,3) = (x2,y2)
replace the previous values of the paramters into the formula for m:
Hence, the slope of the given line AB is 1/3