# Visualise: Interactions with Two Categorical Variables controlled for a continous variable

What is the best way to visualise an interaction between two categorial variables controlled for a third continous variable.

e.g.

model = lm(mpg ~ wt + (factor(am) * factor(vs)), data=mtcars)


I have model where the interaction between two dichotomous variables (TRUE/FALSE) only appears if a third continous variable is controlled for.