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lynna
New Member

USA
2 Posts

Posted - 10/16/2007 :  18:56:55  Show Profile  Reply with Quote
Please help me fine and equation for the left half of the circle given by (x+2)+y=9

I foiled the x+2 and solved for x. the answer I got was x= -y-4x-5 but I didn't know if it was ok to still have the x in the answer.
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skeeter
Advanced Member

USA
5634 Posts

Posted - 10/16/2007 :  19:28:50  Show Profile  Reply with Quote
(x + 2) + y = 9

(x + 2) = 9 - y

x + 2 = -(9 - y)

x = -[2 + (9 - y)]

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sahsjing
Advanced Member

USA
2399 Posts

Posted - 10/17/2007 :  16:48:27  Show Profile  Reply with Quote
This is the same as you switch x and y, and then find the lower half of the circle.
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skeeter
Advanced Member

USA
5634 Posts

Posted - 10/18/2007 :  08:13:36  Show Profile  Reply with Quote
quote:
Originally posted by David

Skeeter, isn't that just a translation of the entire circle to the left?
If she wants the left half, should there not be boundaries defined?

{(x-2) + y^=9; -5<=x<=-2}




plot some points using my last equation and see the result for yourself.
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