since the slope line passing through two points (x1, y1) and (x2, y2) is
m = y2 - y1/x2 - x1
the this poins given (3, 0) and (8, 9)
m = 9 - 0/8 - 3
m = 9/5
therefore the slope of the line is 9/5
using the point-slope formular:
y - y1 = m(x - x1)
y - 0 = 9/5(x - 3)
therefore,
y = 9/5(x-3)