# How to Find XY-Equations?

When you have two variables, you can find the relationship between them using an XY equation. In an XY equation, the x variable is the independent variable and the y variable is the dependent varia...
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http://www.ehow.com/how_8345035_xyequations.html

## How to Find the Equations of Spheres?

If you know a sphere's radius and the coordinates of its center, you can write the equation of the sphere in three dimensions using the variables X, Y and Z. Knowing how to express a sphere in mat...
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http://www.ehow.com/how_8152480_equations-spheres.html

## How to Find Polar Equations?

The polar coordinate system is a two-dimensional mathematical coordinate system that serves as an alternative to the familiar Cartesian coordinate system. In the polar coordinate system, points ar...
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http://www.ehow.com/how_8114351_polar-equations.html

## How to Find Equations of Planes?

The equation of a plane is a fundamental building block of mathematics. A plan is defined by three points in space. This may be one of the simplest forms of three-dimensional equations and is there...
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http://www.ehow.com/how_8072475_equations-planes.html

## How to Find the Intersection of Two Equations?

Basic algebra often requires you to find the intersection of two lines, of the form ax + by = c and dx + ey = f. Accomplish this by solving for either y or x in both equations, then setting the equ...
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http://www.ehow.com/how_8134636_intersection-two-equations.html