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Website
Math Medics

S.o.s. Math: First Order Differential Equations

For Students 9th - 10th
This lesson defines a first order differential equation and provides links to properties of first order differential equations.
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Handout
Harvey Mudd College

Harvey Mudd College: Elementary Solution Methods for First Order Od Es

For Students 10th - 12th
Elementary Solution Methods for First-Order ODEs: Contains a large amount of information regarding first order differential equations, including definitions, examples, and basic properties.
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Activity
Texas Instruments

Texas Instruments: Differential Equations

For Teachers 9th - 10th
In this activity, students analyze first order, second order, and autonomous systems of two first order differential equations.
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Activity
Texas Instruments

Texas Instruments: Higher Order Differential Equations

For Teachers 9th - 10th
In this activity, students use the calculator to graph the solution to a second-order and third-order differential equations. They convert higher order differential equations by substitution to a system of first order differential...
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Handout
Wolfram Research

Wolfram Math World: First Order Ordinary Differential Equation

For Students 9th - 10th
This math site defines a first order differential equation. Includes information on how to solve an equation of this form and also how to find the roots.
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Handout
University of Texas at Austin

Euler's Method

For Students 9th - 10th
This site contains a description and problems dealing with Euler's method. The site discusses why the Euler method is not used in scientific computations.
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Handout
Math Words

Math words.com: First Order Differential Equation

For Students 9th - 10th
Explains what a first order differential equation is. An example is also given.
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Activity
eFunda

Efunda: First Order Ordinary Differential Equations

For Students 9th - 10th
This site from Efunda provides a defintion and examples of the use of first oder ordinary differential equations.
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Activity
Other

Analytic Methods for Exact/linear Differential Equations

For Students 9th - 10th
Shows how to solve both exact and linear differential equations.
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Activity
Interactive Mathematics

Interactive Mathematics: Linear D Es of Order 1

For Students 9th - 10th
Several problems are presented to demonstrate the process of solving linear differentiable equations using an integrating factor. A few of the examples have the solution hidden, so you can work the problem first then check your answer.