Actually Welcome to the Concept of the Slopes and Tangents.
Basically the above data is the representation of the linear equation.
Thus the slope of linear equation is given as,
m = (y2-y1) / (x2-x1)
so taking any randoms numbers from the given table, we get as,
m = (14-7)/(16-8)
m= (7)/(8)
slope = m = 0.875