Worked examples
Two examples
Example 1
The function is the set of pairs (1, 4), (2, 5), (3, 4). What is its domain?
- The domain is all the x-values, the first numbers.
Answer: {1, 2, 3}
Example 2
Same function. What is its range?
- The range is all the y-values, each listed once: 4 appears twice but is written once.
Answer: {4, 5}
Where this is taught: Lines on the Grid, “One more name for y”
The drill
Ten problems
How many:
Type the numbers with commas between them, like -2, 0, 5, or tap your answer. Then press Check my answers at the bottom.Write your answer on the line, or circle it. The answer key, with the reasoning, is on the last page.