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4.4 Writing a Function Rule

4.4 Writing a Function Rule. Objective: SWBAT write a function rule given a table or a situation. Mini Quiz 36. 1. a) Is this a function? {(2, 7), (-1, 3), (-4, 6), (-1, 0)} b) Find the domain and range. 2. a) Is this a function? (copy the graph) b) Find the domain and range.

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4.4 Writing a Function Rule

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  1. 4.4 Writing a Function Rule Objective: SWBAT write a function rule given a table or a situation.

  2. Mini Quiz 36 1. a) Is this a function? {(2, 7), (-1, 3), (-4, 6), (-1, 0)} b) Find the domain and range. 2. a) Is this a function? (copy the graph) b) Find the domain and range. 3. Graph the function f(x) = -2x – 1.

  3. Quick Review 1. What does “f(x)” mean? f(x) is the same as y, just a different notation. 2. How do you find the range, if you are given the domain? Plug in the domain values to find the range. 3. How do you graph a function? Make a table and pick at least 3 points to plug into the “x” and graph each ordered pair.

  4. Write a Function Rule (Table) Step: 1. Find a pattern. Think, “how did they get from x to y?” 2. Write an equation from the pattern. 3. Check the equation for a couple of domain values.

  5. Write a Function Rule (Table) 1. 3. 1. 2. y = x + 4 y = 2x f(x) = x2

  6. Write a Function Rule (Table) 1. 6. 4. 5. y = x – 2 f(x) = 3x y = -x – 4

  7. Write a Function Rule (Situation) Step: 1. Define your variables (2). 2. Write an equation according to the situation. 3. Check the equation.

  8. Write a Function Rule (Situation) Write a function rule for each situation. 7. The total cost t(c) of c ounces of cinnamon if each ounce costs $.79 t(c) = total cost c = ounces t(c) = $.79c

  9. Wrap Up • Writing a Function Rule • From a table • From a situation • Always check your equation to see if it makes sense! HW: P. 196 #1-9 and pg 197 #23 a-d

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