# Prove

Prove that k1 and k2 are the equations of two circles. Find the equation of the line that passes through the centers of these circles.

k1: x

k2: x

k1: x

^{2}+y^{2}+2x+4y+1=0k2: x

^{2}+y^{2}-8x+6y+9=0## Correct answer:

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The line slope calculator is helpful for basic calculations in analytic geometry. The coordinates of two points in the plane calculate slope, normal and parametric line equation(s), slope, directional angle, direction vector, the length of the segment, intersections of the coordinate axes, etc.

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Are you looking for help with calculating roots of a quadratic equation?

Do you have a linear equation or system of equations and are looking for its solution? Or do you have a quadratic equation?

See also our right triangle calculator.

See also our trigonometric triangle calculator.

### You need to know the following knowledge to solve this word math problem:

**geometry**- analytic geometry
- line
**algebra**- quadratic equation
- equation
**planimetrics**- Pythagorean theorem
- right triangle
- circle
- triangle
**basic functions**- reason

#### Themes, topics:

### Grade of the word problem:

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