-∞ < x < ∞
y ≥ 4
-∞ < y < ∞
x ≥ 4
?
?
Domain:
Range:
Since the graph continues up toward the left and up toward the right, the domain contains all real numbers, from negative infinity to positive infinity.
Since the minimum y-value of the function is 4 and the graph continues to extend upward, the range contains all real numbers greater than or equal to 4.