f(x) = (m - 1)x - 2m - 3
a) 4 = (m - 1) * 1 - 2m - 3 <=> 4 = m - 1 - 2m - 3 <=> 8 = -m <=> m = -8
b) 0 = (m - 1) * (-2) - 2m - 3 <=> 0 = -2m + 2 - 2m - 3 <=> 4m = -1 <=> m = -1/4
c) 4 = (m - 1) * 0 - 2m - 3 <=> 2m = -7 <=> m = -7/2
d) m - 1 < 0 <=> m < 1 <=> m ∈ (-∞, 1)
e) m - 1 = 1/2 <=> m = 3/2