The equation of circle A is x2 + y2 + Cx + Dy + E = 0. If the circle is moved horizontally to the left of the y-axis without changing the radius, how are the coefficients C and D affected?

Question

parthkohli · Answer

Do you mean we're reflecting the circle? Or are we just moving it to the left anywhere we want to?

anonymous · Answer

just moving it to the left

anonymous · Answer

just moving it to the left @ParthKohli

parthkohli · Answer

Oh sorry. OK. So here, you're replacing $x $ with $x + t$.

anonymous · Answer

no prob. and what do x and t represent in the equation?

anonymous · Answer

it is *died*

parthkohli · Answer

$x$ is the $x$ in the equation. Do you know how transformation of a coordinate system works?

anonymous · Answer

i know the stuff i was taught in geometry

anonymous · Answer

i understand more now that i thought about it, but it doesnt tell me how far to the left to move it so i dont know how to tell what the constants will do...

parthkohli · Answer

Well what if they meant reflection?

parthkohli · Answer

If they meant reflection then you replace $x$ by $-x$ and that answer will make more sense.

anonymous · Answer

ohhh okay so x would become negative and y would remain the same?