Hello, thank you for taking the time to post your question!
The underlying equation that you want to use here is the slope formula: m=(y2−y1)/(x2−x1)
For this set of values, we have the points (0,4) and (−3,0) .... plugging these values into the slope formula yields:
m=(0−4)/(−3−0)
m=−4/−3
m=4/3
so the slope in this situation is 4/3
I hope that helps you get moving in a better direction on this type of question! Feel free to reach out if you have any additional questions beyond that :)