b. 2
step-by-step explanation:
the slope of a line =δy/δx
δy= y₂-y₁
δx= x₂-x₁
therefore, using the points (-2,-3) and (3,7) we can calculate gradient as follows:
m=(7--3)/(3--2) (a number minus a negative number the sign changes to a plus)
m=(7+10)/(3+2)
=10/5
=2