1. Writing Rules for Linear Functions Pages 418 - 422
Section 8.4
Writing Rules
for
Linear Functions
Pages

2. A function rule is an equation that describes a function.
A function can be written in function notation using f (x) instead of y .
You read f (x) as “f of x”.
A function rule is an equation that describes a function.
y = 3x f (x) = 3x + 7
function rule
function rule

3. To write a function rule from a table, look for a pattern.
The slope m is the difference in f(x) values
b is the value of f(x) when x = 0.
difference in x values
A rule for the function is f(x) = 3x + 1.

4. Write a rule for each linear function.x
f(x) -1 -2 1 2 4 x
f(x) -3 6 3 -6
-12

5. x
f(x) -6
-11 -4 -7 -2 -3 1 x
f(x) -3
-17 -1
-11 1 -5 3

7. Write a rule for the graphed function.
slope:
y- intercept:

8. Homework
Pages
#s 1-8, 28-30