Answer: -1
Explanation:
slope form is
M is the slope. x1 and y1 are coordinates of a point along the line. x2 and y2 are the coordinates of another point along the line.
So we need to substitute in the points you have. let's put in (1, -2) for x1 and y1, and (2, -3) in x2 and y2. it makes
Now all you have to do is solve the equation.
m = -1
(btw the line's equation would be y = -x - 1)