Posted by **Lance** on Monday, January 7, 2013 at 2:26pm.

What are the equations of the lines through (-5,-3) and passing at distance 2sqrt5 from (5,7)

Please I really need your help. I do not know how to do this problem.

- Math,Geometry -
**Anonymous**, Monday, January 7, 2013 at 7:08pm
you are looking for two of the radii of the circle (x+5)^2 + (y+3)^2 = r^2

r^2 equals the square of the distance from (-5,-3) to (5,7), minus (2√5)^2

the radii are tangent to

(x-5)^2 + (y-7)^2 = 20

the points of tangency (intersections of the two circles) will give the points needed (along with (-5,-3))to write the equations of the lines

## Answer this Question

## Related Questions

- Math,Geometry - What are the equations of the lines through (-5,-3) and passing ...
- geometry - What are the equations of the lines through (-5, -3) and passing at ...
- Analytic Geometry - Find the equation of a circle passing through (-1,6) and ...
- Analytic Geometry - Find the equation of a circle passing through (3,7) and ...
- Calculus - Determine the equations of the following lines: (a) having slope ¡1 ...
- Geometry - Find the equations of lines parallel to and perpendicular to the ...
- college physics - The intensity of an earthquake wave passing through the Earth ...
- Precalculus check answers help! - 16. Find the distance between P (–2, 5) and ...
- Precalculus check answers help! - 16. Find the distance between P (–2, 5) and ...
- Analytic Geometry - Find the equation of a circle passing through (3,7) and ...

More Related Questions