Apps in this category may contain mild or occasional cartoon, fantasy or real-life violence, as well as occasional or mild adult, sexually suggestive or horrifying content and may not be suitable for children under 9 years of age.

12+

Apps in this category may contain occasional mild indecent language, frequent or intense cartoon or real-life violence, minor or occasional adult or sexually suggestive material, and simulated gambling, and may be for children under 12 years of age.

17+

You must be at least 17 years old to access this App.

Apps in this category may contain frequent and intense offensive language; Frequent and intense cartoon, fantasy or realistic violence: frequent and intense adult, scary and sexually suggestive subjects: as well as sexual content, nudity, tobacco, alcohol and drugs, may not be suitable for children under 17 years of age.

20/20 Straight Line Equations Screenshots

iPad

iPhone

About 20/20 Straight Line Equations

A power learning aid combining Practice, Coaching Calculators, Coaching Videos and Guide to help students master finding slopes and equations of straight lines.

Coaching Calculators :

- finding slope given two points

- finding equation given a point and slope

- finding equation given two points

- finding equation given point and parallel line

- finding equation given point and perpendicular line

Choice of point-slope and slope-intercept methods when finding equations.

It's ideal for students as the design reinforces each problem solving step.

Examples highlight and simplify algebra that students find hard.

What's New in the Latest Version 7.6

Last updated on Apr 9, 2024

Old Versions

This version contains minor bug fixes.

Version History

7.6

Apr 9, 2024

This version contains minor bug fixes.

7.5

Mar 28, 2024

iOS 17 compatibility and minor bug fixes.

7.4

Dec 11, 2022

This version has minor bug fixes.

7.3

Sep 2, 2022

This version contains minor bug fixes and enhancements.

7.2

Nov 20, 2021

iOS 15 compatibility and user interface improvements.

7.1

Oct 11, 2021

iOS 15 compatibility and minor bug fixes.

7.0

Jul 1, 2020

Minor bug fixes.

6.9

Jun 20, 2020

New Coaching Video modules. Minor bug fixes.

6.8

Jun 7, 2020

Major revision including new parallel and perpendicular lines modules.

6.7

Jan 22, 2020

Minor bug fixes and enhancements.

6.6

Jan 14, 2020

Minor bug fixes and app streamlining. Secondary modules are moving to free apps for you to GET if you wish.

6.5

Oct 5, 2019

New transpose option for linear equations and inequalities. Minor bug fixes.

6.4

Sep 26, 2019

iOS 13 and iPadOS compatibility.

6.3

Jan 20, 2019

Major revision with streamlined user interface. Minor bug fixes.

6.2

Sep 25, 2018

Universal iPhone and iPad app. iOS 12 compatibility.

6.1

Nov 17, 2017

iOS 11 and iPhone X compatibility and minor bug fixes.

6.0

Sep 13, 2016

iOS 10 compatibility and bug fixes.

5.1

Sep 16, 2015

iOS 9 compatibility and bug fixes.

5.0

Apr 14, 2015

Improved Guides for iPhone 6 and iPhone 6 Plus and minor bug fixes.

4.0

Sep 26, 2013

iOS 7 version.

3.0

Mar 13, 2013

Major revision includes Coaching Calculators for slope, equation of line given point and slope, equation of line given two points. Calculator features point-slope and slope-intercept methods.

2.2

Sep 25, 2012

iOS 6 and iPhone 5 compatibility.

2.1

Dec 17, 2010

Minor bug fixes and layout changes.

2.0

Dec 3, 2010

New menu system and revised Guide.

1.1

Jul 15, 2009

App requires OS 3. Minor changes.