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need help pls 

cerenetie  Feb 22, 2018
 #1
avatar+91149 
+2

2.   The center is  (-1,1)

 

a) Note that the point  (-1,4)  is also on the graph...and the distance between this point and the center is jthe radius....this is given by the difference of the y coordinates   ( 4 - 1)  =  3

 

b) 

Graphing form  

 (x + 1)^2  + (y - 1)^2  =   9

 

Gerenral form...expand the graphing form

 

x^2 + 2x + 1 + y^2 - 2y + 1   = 9

 

x^2 + y^2 + 2x - 2y + 2  =  9           subtract 9 from both sides

 

x^2 + y^2 + 2x - 2y  - 7   =  0

 

 

cool cool cool

CPhill  Feb 22, 2018

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