Explanation:
many greetings to your teacher from me - what an embarrassing typo in the question.
the question should be : what is the slope of the line ?
the slope of a line is the ratio
y coordinate difference / x coordinate difference
when going from one point on the line to another.
all we need to do is find 2 points with "nice" coordinates, and then we calculate the ratio as described.
the graph seems to give us several possibilities.
I pick the points (0, 3) and (1, 1).
now, when we calculate the coordinate differences, the direction overall does not matter. but it is important that we use the same direction for the x and the y difference.
when we go from (0, 3) to (1, 1)
x changes by +1 (from 0 to 1).
y changes by -2 (from 3 to 1).
the slope is -2/+1 = -2.