T is to 9 as 7 is to 39

An unknown number of kids and buses are getting assigned. when assigning 4 kids to each bus, there are 2 kids that aren't placed in a bus. when assigning 8 kids to each bus, there are 2 empty buses. how many total kids are there?

Don't know how to find x given these segment lengths

Which point-slope form equation represents a line that passes through (3,-2) with a slope of -4/5