A(2,5), B(3,1)

What is your question?

A(2, 5), B(3, 1).

m = (1-5)/(3-2) = -4.
Y = mx + b.
5 = -4*2 + b,
b = 13 = Y-intercept.
Eq: Y = -4x + 13. Slope-intercept form.
4x + y = 13. Standard form.

It seems like you have provided the coordinates of two points, A(2,5) and B(3,1). How can I assist you further with these coordinates?