Worked examples
Two examples
Example 1
Function A is y = 2x + 5. Function B goes 1, 4, 7, 10 for x = 0, 1, 2, 3. Which has the greater rate of change?
- A’s rate is its slope, 2.
- B goes up 3 for each 1 in x. 3 is greater.
Answer: Function B
Example 2
Same two functions. Which has the greater y-intercept?
- A’s y-intercept is 5. B’s is 1, its y when x = 0.
Answer: Function A
Where this is taught: Quiz 41: Functions, “Finding the rule when it is a straight line”
The drill
Ten problems
This drill also has challenge problems. They use the same skill, set up the way the GED test sometimes sets up a problem, so that it looks new at first.
How many:
Tap your answer to each one, then press Check my answers at the bottom.Circle your answer to each one. The answer key, with the reasoning, is on the last page.