Natalia Buza

9-14-10

Objective: Students will be able to find parallel and perpendicular lines to a given line.

Parallel:
y=5x+7
y=5x+2
y=5x+1
y=5x-1,000,000,000

**If they have the same slope their parallel

y=3x+2
y=1/3x
(2,-4)- point of intersection
-4=1/3(2)+b
-4=2/3+b
-42/3=b

2 ways to find where perpendicular intersect
1st-subtract

y=4x+5
-(y=-1/4x+3)
--------------
0=4.25x+2
-2 -2
--------------
-2 = 4.25x
--- -----
4.25 4.25

-200 = -8
----- ---
425 17

y=4(8/17)+5
=53
--
17
(-8/17, 53/17)

2nd way:calculator

4x-y=-5
-1/4x-y=-3
[4 -1 -5
-1/4 -1 -3]

hw: pg 16 5-14