The table below shows the amount of money, in hundreds of dollars, elliot has saved after different numbers of years:
identify the function that represents elliot's savings and the amount that elliot will have saved in 9 years.

y = 15x, in 9 years he will have saved $13,500
y = x + 15, in 9 years he will have saved $2,400
y = 6x, in 9 years he will have saved $5,400
y = x + 90, in 9 years he will have saved $9,900