The domain of a function is the set of all possible x-values. The range is the set of all possible y-values. Notice that, horizontally, our graph spans to x=6, not inclusive, and continues in a negative direction infinitely. This value is the upper boundary of our domain.
Domain: x < 6
Meanwhile, vertically, our graph spans to y=6, inclusive, then continues infinitely in the negative direction. This means y=6 is the value of the upper boundary of our range.
Range: y ≤ 6
b
Again, let's take a look at the given graph.
The domain of a function is the set of all possible x-values. The range is the set of all possible y-values. Notice that, horizontally, our graph spans all real numbers.
Domain: All real numbers
Meanwhile, vertically, our graph spans from y=-3 to y=3, inclusive. These are the upper and lower boundaries of our range.
Range: -3≤ y ≤ 3
