Find the equation of the line through (-8, 9) with x-intercept trice the y-intercept.
(x,0), (-8,9), (0,y). X = 3y,
(3y,0), (-8,9),(0,y).
m = (9-0)/(-8-3y) = (y-9)/(0+8), 72/(-8-3y) = y-9, -8y-3y^2+72+27y = 72, -3y^2+19y = 0,
y(-3y+19) = 0, Y = 0, -3y+19 = 0, 3y = 19, X = 3y = 19, Y = 6 1/3 = 19/3.
m = 9/(-8-19) = -1/3.
Y = mx + b = 9, (-1/3)(-8) + b = 9, b = 9-8/3 = 19/3 = 6 1/3.
Eq: Y = -x/3 + 19/3.