How do you factor 13n+39

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

Click on the y intercept. -x +4 i know you cant click on it so could you just say the coordinates like (example - (1,0) you so much.

Which of these numbers of simulations of an event would be most likely to produce results that are closest to those predicted by probability theory? 15, 20, 5, 10