The point slope equation form is y - y1 = m(x - x1).
y1 and x1 represents known coordinates of a known point. For example, in the equation you gave us, 10 and -3 represents the coordinates of a point as (-3,10).
While x and y represents the coordinates of an unknown point, which we may need to find based on the question given, as (x, y).
m represents the slope of the equation, which is in the example you gave us m= 8/5.
The picture down the answer represents the graphical representation of the equation you gave us: y-10 = 8/5 (x+3).
Hope this Helps! :)
