if you are to find the slope of the given points, then you'll have it as:
[tex]m = \frac{y_2 - y_1}{x_2 - x_1} [/tex]
[tex]m = \frac{4-1}{5-2} [/tex]
m = 1
if you are asked of the equation of the line then you'll have it as
(x-x1)m = (y-y1)
since we already know m then all you have to do is assign a point either (2,1) or (5,4) to the equation. let's have (2,1)
(x - 2)1 = (y - 1)
x - 2 = y - 1
y - x = -2 + 1
y - x = -1
or in slope-intercept form
y = x -1
