# 20/20 Linear Inequalities — The tutor in your pocket.

> The tutor in your pocket. (iPhone/iPad app by Walter Kissach.)

- Source: https://appshunter.io/ios/app/2020-linear-inequalities/id598287686 (this page in markdown: same URL + `.md`)
- Developer: [Walter Kissach](https://appshunter.io/developer/293232788)
- Category: Education, Reference
- Price: $0.99
- Age rating: 4+
- Requires: iOS 18.0 · 3 MB
- Languages: English
- Released: 2013-02-06
- Data updated: 2026-06-10
- User reviews in markdown: https://appshunter.io/ios/app/2020-linear-inequalities/id598287686/reviews.md

## What is 20/20 Linear Inequalities?

A power learning aid combines Coaching Calculators, Practice and Guide to help students master linear inequalities.

The Coaching Calculators focus on one-step,  two-step  and multi-step  linear inequalities as well as those containing parentheses, decimals and fractions  :

one-step :  x − 2  ≤  3 , x/7  ≥  2

two-step :  3x + 8  ≤  20, 2 ≥ 5 − 6x

multi-step : 4 + 9x  ≥  2x − 18

parentheses : 2(3 − 4x)  ≤  2x + 9

decimals : 0.25x + 1.5  =  9.9 − 0.2x

fractions :  (1/2)x − 5  ≥ 3x + 1/5

Practice focuses on all of the above as well as harder inequalities with parentheses and fractions :

10 − 3(2 − 3(x + 5))  =  2x + 9

(1/2)(2x − 5)  ≥ 3x + 3/4

Students learn quickly as they work with Coaching Calculators and Practice to review each step of the solving process.

The Guide includes step-by-step worked examples that highlight key differences between solving linear inequalities and solving linear equations.


## Version history (last 5 releases)

### 6.2 — 2025-09-16

This version is iOS 18 compatible and has minor bug fixes.

### 6.1 — 2024-04-08

This version contains minor bug fixes.

### 6.0 — 2024-03-28

iOS 17 compatibility and minor bug fixes.

### 5.9 — 2022-12-11

This version has minor bug fixes.

### 5.8 — 2022-09-02

This version contains minor bug fixes and enhancements.

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## More apps by Walter Kissach

- [Quadratic Inequalities](https://appshunter.io/ios/app/quadratic-inequalities/id293232785)
- [Circles and Equations](https://appshunter.io/ios/app/circles-and-equations/id293619582)
- [Even and Odd Polynomials](https://appshunter.io/ios/app/even-and-odd-polynomials/id293668394)
- [Quadratic Factoring](https://appshunter.io/ios/app/quadratic-factoring/id294040055)
- [Quadratic Equations](https://appshunter.io/ios/app/quadratic-equations/id294195555)
- [20/20 Fraction Basics](https://appshunter.io/ios/app/2020-fraction-basics/id298766849)

All apps by Walter Kissach: https://appshunter.io/developer/293232788

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*