y-intercept for x = 0.
Substitute x = 0 to the equation of the function:

It is 10 more in the thousands than the hundreds... multiply 100 x 10...
The amount of girls in the club is 18 out of the 32 members.
To find the amount of boys there, we subtract 18 out of 32
32 - 18 = 14
so there are 14 boys in the club
Now to find the ratio of girls to boys...
18/14
simplified to 9/7 (option D.)
Hope this helps :)