Step-by-step explanation: Let's first write the coordinates of each point.
When finding the coordinates of a
given point, be very careful with your signs.
On the x-axis, left means negative and right means positive
and on the y-axis, down means negative and up means positive.
The points in this problem are (-1, -2), (4, -2), (1, 1), (2, 3).
The domain is the set of all x-coordinates.
So here, the domain or D = {-1, 4, 1, 2}.
The range is the set of all y-coordinates.
So here, the range is {-2, 1, 3}.
Notice that I only listed the 1 once.
We only need to mention it once in our range.
Finally, let's determine if it' a function.
If none of the x-coordinates repeat, it's a function.
Since none of them do repeat, it's a function.
