1. Final Exam Review
Chapters 3 & 4

2. Topics Graphing Vertical and Horizontal Lines Intercepts Slope
Slope-Intercept Form

3. Topics
Writing Equations
Word Problems
Standard Form

4. Horizontal Lines Only go through the y-axis Do not touch the x-axis
The equation only has a y
Example: y = 3

5. Vertical Lines Only go through the x-axis Do not touch the y-axis
The equation only has a x
Example: x = -2

6. Graph using Intercepts: 5x + 2y = 20
x-intercept 5x + 2•0 = 20 5x = 20 x = 4 (4,0)
y-intercept
5•0 + 2y = 20
2y = 20
y = 10
(0,10)

7. Find the slope between 2 points
(-8, 5) and (-3, 9) m =

8. Graph: y = 3x – 4
m = 3
b = - 4

9. Writing Equations
Write the equation of the line whose slope is -2 and whose y-intercept is 5. y = mx + b y = x + y = -2x + 5 m b -2 5

10. Writing Equations
Write an equation of the line that passes through (6, -3) and has a slope of -2. y = mx + b = ‧ + b -3 = + b = b y = x + m x y -3 -2 6
-12 -2 9

11. Write the equation of the line that passes through the points (1,6) and (3, -4).
Slope: y-intercept: pick either point 6 = -5 ‧ 1 + b 6 = b = b Write equation: y = –5x + 11

12. Word Problems Write an equation that models the situation:
An Internet service charges $1.63 for the first hour of connection. Each additional hour costs $.87.
y = .87x

13. Write the equation y = 3x + 2 in Standard Form.
y = 3x x -3x -3x + y = 2

14. Practice
Worksheet – “Chapters 3 & 4 Review”

15. Homework
Page 207 #2-5,10-14
Page 277 #2-8