1. 8.4 writing equations March 05, 2012
Find the slope.
1. (3, 1) and (2, 1)
2. (­5, 2) and (4, ­1)
Solve for y.
3. 6x + 3y = 12
4. 5y ­ 10 = 15x
Bellwork
Objective: write rules for linear functions
HW pg. 420 #2­24 evens 1

2. 8.4 writing equations March 05, 2012
HW pg. 420 #2­24 evens 2

3. 8.4 writing equations March 05, 2012
function notation ­ f(x) (fancy name for y) x ­ input
f(x) ­ output
Paulo works at a local store. Each week he earns $300 salary plus a 3% commission on his sales.
Write a function rule that relates total earnings to sales.
Find Paulo's earnings for one week if his sales are $2,500.
HW pg. 420 #2­24 evens 3

4. 8.4 writing equations March 05, 2012
To write a function rule from a table, look for a pattern.
The slope is the difference in f(x) values, and the b is the value of f(x) when x = 0.
difference in x values
Write a rule for the linear function in the table.
x f(x)
­2 ­5
0 1
2 7
4 13
HW pg. 420 #2­24 evens 4

5. 8.4 writing equations March 05, 2012
Write a rule for the linear function.
HW pg. 420 #2­24 evens 5

6. 8.4 writing equations March 05, 2012
Page 420 # 2 ­ 24 even
HW pg. 420 #2­24 evens 6