+0  
 
0
82
2
avatar+269 

 

i tried graphing this but i keep getting the points wrong

cerenetie  Feb 21, 2018
Sort: 

2+0 Answers

 #1
avatar+86622 
+2

Frst one   

 

Scale Factor  1/2      Dilation Center(-1, 1)

 

We need this formula

 

New Point '  = [ Old Point  - Dilation Center ] * Scale Factor  + Dilation Center

 

Remember that    (a , b)  -  ( c, d)  =  ( a - c, b - d)

And  C(a, b)  =  (Ca, Cb)

 

A'  = 

[ (-4, 4)  - ( -1, 1)]  * (1/2)  +  (-1, 1) =

 (-3, 3)* (1/2)  + (-1, 1)   =

(-3/2, 3/2) + (-1, 1)  =

(-5/2, 5/2)

 

B' =

[ (2, 4) - (-1, 1)]* (1/2)  + (-1, 1)  =

[ (3, 3) * (1/2) + ( -1, 1)  =

(3/2, 3/2) + (-1, 1) =

(1/2, 5/2)

 

C'  =  [ (-4, 1) - (-1, 1) ] * (1/2) + (-1, 1)  =

[ (-3, 0) ]* (1/2) + (-1, 1 )  =

(-3/2, 0)  + (-1, 1)  =

(-5/2, 1)

 

Here's a pic :

 

 

 

 

 

cool cool cool

CPhill  Feb 21, 2018
edited by CPhill  Feb 21, 2018
 #2
avatar+86622 
+2

Second one

 

Scale factor  =  1/2      Dilation Center  = (8, -6)

 

A'  =

[(-4, 4) - (8, - 6) ] * (1/2)  + (8, - 6) =

[ (-12, 10] * (1/2) + (8, -6)  =

(-6, 5) + (8, -6)  =

(2, -1)

 

B' = 

[ (4, 2)  -  (8, -6) ] *(1/2) + (8, -6) =

[ (-4, 8) ] * (1/2) +  ( 8, -6)  =

(-2, 4)  + ( 8 , - 6)

(6, -2)

 

C'  =

[ (-6, -4) - ( 8, -6) ] * (1/2)  +  (8, -6)  =

[ (-14, 2) ] * (1/2) + (8, -6)  =

(-7, 1)  +  ( 8, - 6)

(1, -5)

 

Here's a pic :

 

 

 

cool cool cool

CPhill  Feb 21, 2018

9 Online Users

avatar
New Privacy Policy (May 2018)
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  Privacy Policy