ggplot - graph bars and line

I need to plot bars and line using the data frame named mydata2.
I am able to plot only bars using :

p <-ggplot(mydata, aes(as.character(months), y=values))
p +geom_bar(stat = "identity", aes(fill = type), width = 0.6, position="dodge")+
  ylab("Incidencias (pp.)")+
  theme(legend.position = "top",
        legend.justification = "left",
        legend.direction = "horizontal",
        legend.title = element_blank(),
        legend.key.size = unit(0.5,"line"))

     months           values                                   type  
Min.   :201708   Min.   :-2.09614   inc. cok :25  
1st Qu.:201802   1st Qu.:-0.56529   inc. in :25  
Median :201808   Median : 0.00099   Vari  :25  
Mean   :201819   Mean   : 0.03232                                    
3rd Qu.:201902   3rd Qu.: 0.47003                                    
Max.   :201908   Max.   : 2.36371
However, I need to plot using geom_bar the data related to "inc. cok" and "inc. in", but also, graph using geom_line "Vari".
If anyone knows the way, please give me a hand.
I've reading a lot of web links but I am stuck interpreting the code.
Thank you for your time and interest