Question 319916
LINEAR ___ y = mx + b


"f(-1) = 1 + f(2)" ___ m(-1) + b = 1 + m(2) + b


subtracting b ___ -m = 1 + 2m ___ -1 = 3m ___ -1/3 = m


"f(3) = 4 * f(1)" ___ (-1/3)(3) + b = 4[(-1/3)(1) + b] ___ -1 + b = -4/3 + 4b


1/3 = 3b ___ 1/9 = b


y = (-1/3)x + 1/9 ___ 3x + 9y = 1