Ch 8 Linear Functions

1. Chapter 8 – Functions and
Graphing
8.2 – Linear Equations in
Two Variables

2. Did you know that crickets can
tell the temperature?
Chirps in Temperature
15 seconds T = c+ 40 ( F) 100
21 90
23 80
31
70
Temperature
50
60
47
50
•Write the relation as a set of 40
coordinate points.
30
20
•What is the domain of the 10
relation?
10 20 30 40 50 60
Chirps in 15 seconds
•What is the range of the relation?

3. Staircase Towers
What expression can
we use to represent
the nth tower?
B = 2n + 1
number of tower number
blocks
1 2 3 4

4. Let’s use the pattern to make a
table of values.
n B = 2n + 1 B (n, B)
1 B = 2(1) + 1 3 (1, 3)
2 B = 2(2) + 1 5
3 B = 2(3) + 1
4
5
6
7
8

5. A linear equation in two variables is
an equation in which the variables
appear in separate terms and neither
variable contains an exponent other
than the number 1.
Use an x-y table to find solutions to linear
relations or equations.

6. Find four solutions of the equation.
Then write the solutions as ordered
pairs.
y=x+1
x y=x+1 y (x, y)

7. Find four solutions for y = 4x – 3. Then
graph y = 4x – 3.
x y = 4x – 3 y

8. Find four solutions for x + y = 10. Then
graph x + y = 10.
x y

9. Use a table to graph y = -2.
x y

10. Questions?
• Homework:
8.2 pg 378
#6-48
(div by 3)