# 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 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 Y-Intercepts of Equations?

In order to graph any equation on the Cartesian plane, it's necessary to first find the y-intercept. The y value of all points on the x-axis is zero. Similarly, the x value of all points on the y-a...
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http://www.ehow.com/how_8295258_yintercepts-equations.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

## How to Find Asymptotes on Equations?

Often, equations will approach a line, whether that line is vertical or horizontal, but never actually cross the line, because crossing the line would result in the equation becoming undefined. Fin...
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http://www.ehow.com/how_8409726_asymptotes-equations.html