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.
Oy - 6 = 3(x - 10)
Oy - 16 = 3(x - 9)
y = 3x - 11
y = -3x - 23