slope = rise / run
m = (y2 - y1) / (x2 - x1)
m = (11 - -4) / (4 - -1)
m = (11 + 4) / (4 + 1)
m = 15 /5
m = 3
point-slope form, pick one of the points, doesn't matter which one, pick (4,11)
y - y1 = m (x - x1)
y - 11 = 3 (x - 4)
y - 11 = 3x - 12
y = 3x - 1