App Shopper: Simultaneous (Education)

App Activity

Nov 02 '10	Version 1.1
Sep 07 '10	Free -> $.99
Sep 01 '10	New App: Free, v1.0

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Simultaneous

iOS iPhone

Simultaneous Equations is a combined interactive Coaching Calculator and Quick Guide that takes you step-by-step through the solving of a pair of simultaneous linear equations.

The app features the addition method, the elimination method and the substitution method.

Coefficients can be nonzero integers from -999 to 999 inclusive.

You develop skills quickly as you work with the calculator and see each step of the process in detail :

Addition method :

- Choose which variable to eliminate
- Decide how to make its coefficients opposites
- Manipulate equations to make its coefficients opposites
- Eliminate the variable by adding the equations
- Solve resulting equation for the other variable
- Back substitute into an original equation

Elimination method :

- Choose which variable to eliminate
- Decide how to make its coefficients the same (absolute value)
- Manipulate equations appropriately
- Eliminate the variable by adding/subtracting equations
- Solve resulting equation for the other variable
- Back substitute into an original equation

Substitution method :

The steps if you start by solving first equation to express x in terms of y are shown here.

- Solve first equation to express x in terms of y
- Substitute x in second equation and solve for y
- Substitute y solution back into rearranged first equation
- Solve resulting equation for x

Note that the Coaching Calculator shows the steps if you start by solving x or y from either equation.