Julia has made 9 posts while trying out a new social media platform. Starting now, she plans to make

Julia has made 9 posts while trying out a new social media platform. Starting now, she plans to make 1 post daily. Write an equation that shows how the total number of posts, y, depends on the number of elapsed days, x. y=

Julia starts with 9 and adds one post per day on each of x days, so we have:
y = x + 9