1)y = x + 2. D(y) = R.
y = 1/2 x. D(y) = R
y = 2/x. D(y) = (x не равен 0)
y = 3/(x-12). D(y) = (x не равен 12)
y = 5/x. D(y) = (x не равен 0)
y = 5 - x. D(y) = R
y = x/5 - 5. D(y) = R
2)Линейными являются функции:
y = x + 2(k = 1; b = 2)
y = 1/2 x (k = 1/2; b = 0)
y = 5-x(k = -1; b = 5)
y = x/5 - 5 (k = 1/5; b = -5)