Six years after a tree was planted, its height was 7 feet. nine years after it was planted, its height was 16 feet. which of the following equations gives the height y, in feet, of the tree after x years if the tree grows at a constant rate? check all of the boxes that apply.

y – 6 = 3(x – 10)

y – 16 = 3(x – 9)

y = 3x – 11

y = –3x – 23