In order to find the slope of the given line, use the following formula:
m = (y2 - y1)/(x2 - x1)
where (x1,y1) and (x2,y2) are two pair of points of the given table.
Use
(x1,y1) = (3,5)
(x2,y2) = (5,10)
replace the previous values of the parameters into the formula for m:
m = (10 - 5)/(5 - 3)
m = 5/2
m = 2.5
Hence, the slope of the line is 5/2 or 2.5