a simple slopes analysis looks at

A simple slopes analysis is a form of regression analysis that tests for simple, linear relationships between the independent variable and the dependent variable at multiple levels of the moderator variable. This type of analysis is used to explore the nature of the relationship between the independent and dependent variables across different levels or values of the moderator variable. It can also be used to test for interactions between the independent and moderator variables, as well as to look for moderator effects on the strength of the relationship between the independent and dependent variables. The aim of a simple slopes analysis is to gain a better understanding of how the independent and dependent variables interact in the presence of a given moderator.

the effect of one independent variable at individual levels of the other independent variable.