Math 1 · Unit 2 · Lesson 1 · part 8 of 8
Practice Problems
Try them, get help one step at a time, then print how it went.
Warm-up: feed the function
Six quick ones. Replace every x with the input, do the arithmetic, and say which number is the input and which is the output.
My results
Finished the practice? Print a page that shows each question, what you typed or chose, the correct answer, and how it went. Good for showing a teacher or keeping in a folder.
Exit ticket
On paper or an index card.
- In your own words: what does it mean for a rule to be a function? Use the words input and output.
- f(x) = 4x − 3. Find f(2) and f(−1). In f(2), which number is the input and which is the output?
- y = x − 2. Make a table for x = −2, 0, 1, 4, and write each row as a point.
- Plot (−3, 4) and (4, −3) on a grid. Explain why they are different points.
Check your exit ticket
- A function takes an input and gives back exactly one output. The same input always gives the same output, and never two different outputs.
- f(2) = 4 × 2 − 3 = 5. f(−1) = 4 × (−1) − 3 = −7. In f(2) = 5, the input is 2 and the output is 5.
- x = −2 gives y = −4, the point (−2, −4). x = 0 gives y = −2, the point (0, −2). x = 1 gives y = −1, the point (1, −1). x = 4 gives y = 2, the point (4, 2).
- (−3, 4): walk 3 left, then 4 up. (4, −3): walk 4 right, then 3 down. The order in an ordered pair matters, so swapping the numbers moves you to a different place.