What's New
iOS 17 compatibility and minor bug fixes.
App Description
A power learning aid combining Practice, Coaching Calculators and Guides to take you step-by-step through the solving of a pair of simultaneous linear equations.
The app features elimination by Addition, by Addition/Subtraction and substitution methods.
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 :
Elimination by Addition :
- 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 by Addition/Subtraction :
- 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
App Changes
- July 04, 2012 New version 1.2
- September 27, 2012 New version 1.3
- February 15, 2013 New version 1.4
- October 01, 2013 New version 2.1
- March 15, 2015 New version 3.0
- September 26, 2015 New version 3.1
- November 05, 2016 New version 4.0
- June 13, 2019 New version 4.3
- September 27, 2019 New version 4.4
- January 13, 2020 New version 4.5
- January 13, 2020 Price decrease: $0.99 -> FREE!
- January 28, 2020 New version 4.6
- January 28, 2020 Price increase: FREE! -> $0.99
- July 14, 2020 New version 4.7
- May 06, 2021 New version 4.9
- April 24, 2024 New version 5.3