If i have a graph my x axis any y axis is max number 10. So the boxes go

0 space then second box 5 then space then 10.

How do i determined what number is between for the blank box . I tried 2.5 ive tried 3 but it doesnt look right .

So total of boxes and numbers go
0 ? 5 ? 10 ?

if y is a linear function, then

0 2.5 5 7.5 10