1. Warmups
Write an equation in standard form: (1,2)(5,-2)
Find the slope and y-intercept:
6x + y = y + 3 = -1(x + 1)
Determine the value of r: (1, r) (r, -2)

2. QUIZ TIME!!! Take out a pencil and Calculator
Please put everything else away

3. 6-6 Parallel and Perpendicular Lines
Objective: To identify if two lines are parallel, perpendicular or neither

4. Parallel vs. Perpendicular
Parallel – Lines have the same slope //
ex: -2 and -2
Perpendicular – Lines have opposite/reciprocal slopes .
ex: -2 and 1
90°

5. Example 1 Graph the following lines on the same graph: y = -2x + 4
Are they parallel, perpendicular, or neither?
// n

6. Example 2
and
Then circle parallel, perpendicular or neither

7. Example 3
2x + 3y = and
Then circle parallel, perpendicular or neither

8. Example 4
and y = -3x + 2
Then circle parallel, perpendicular or neither

9. Homework Pg. 367 #18-23 & Pg. 771(6-6) #1-6 Look at the SLOPE
Same = parallel
Opposite (opposite sign & reciprocal) = perpendicular
Neither = neither
You do not have to graph on the homework!!