The formula to find the slope of a line is
, in other words the y coordinate of the second point minus the y coordinate of the first point over the x coordinate of the second point minus the x coordinate of the first point.
On this graph, the two points given are (-3,4) and (1,-2). With this, we can determine


Plug these values correctly into the slope formula, and you can find your answer.

The slope of the line is-3/2.
Hope this helps!