Consider the following three functions:
g(x, y) = 4x - 3y + 21
h(x, y, z) = 13x2 + y + 3z
i(z) = z
Which of the following is true regarding the linearity of the functions?
a) none of the functions is linear
b) all three functions are linear
c) h is linear, but g and i are not linear
d) i is linear, but g and h are not linear
e) g and i are linear, but h is not linear
Answer: e