The slope (m) of a line is found from
... m = (change in y)/(change in x)
... m = (22 - 0)/(-8-3) = 22/-11 = -2
The point-slope form of the equation for a line with slope m through point (h, k) can be written
... y = m(x -h) +k
We can use the pont (h, k) = (3, 0) and fill in the values:
... y = -2(x -3) +0
... y = -2x + 6 . . . . . . . simplified