can someone please help me w/ this find an eq'n of the circle

what do you mean? do you mean the centre is at the point 2,5? then why does it matter that its on the line?

>>271658
2x+y+1=0 is a line not a circle lmao
this post is a mess

>>271778
ot to mention he says "find an equation of the circle"...which he the attempts to define with an equation

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sorry my bad i mean find its center tangent on the line 2x+y+1=0 at the point (2,5) if its center is on the line x+y=9

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find the eq of the circle tangent to the line 2x+y+1=0 at the point (2,5) if its center is on the line x+y=9

>>271848
To find the equation of a circle, you need the coords of its center and the length of its radius.

This is a worksafe board

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exactly, but how, can you show me the solution

>>271881
im still not getting what youre asking. is the circle meeting the line 2x+y+1=0 at only 2,5 and has a centre on the other line?

>>271885
because2x+y+1=0 doesnt contain 2,5

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yeah, im confused either, i thought the same thing the first time i encountered the problem, this was just actually a question given to me from a friend

>>271895
>>271888
It must be 2,-5

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ok let's say those really are the points can you show me the solution?

>>271908
The radius of the circle is a segment who is perpendicular to the line 2x+y+1=0 at the point 2,-5.
And this same radius cross the second line at the point which corresponds to the center of the circle.
You have to think the radius like a vector, and use a scalar product to resolve the equation which will gives you the coords of the center of the radius.

>>271881
>>271848
>>271847
>>271658

Unrelated but is this cgi? Source?

Okay. I guess I'll ask what everyone is thinking about asking...

Sauce on the qt3.14?

>>271943
>>271945
https://www.flickr.com/photos/133767722@N08/sets/72157668210893850