Answer is -2/3 slope
Step by step
We have the coordinate pairs of
(0, 3) and (-3, 5) as shown on the attachment
Slope is found by
y2 - y1 over x2 - x1
5 - 3 over -3 - 0
2 over -3
Slope is -2/3
You can also count from point to point y over x
Here we have -2 down and +3 over for a slope of -2/3
Remember if your line going left to right goes at a downward angle, it is a negative slope.