LINEQ: The Linear Equation TI84 Program

As a student dealing with linear equations on a regular basis, you know how critical it is to have the right tools at your disposal. Solving linear equations by hand can be time-consuming and error-prone, which is why having a reliable and efficient solution is essential. The linear equation program for the TI84 calculator is a powerful tool that can streamline your linear equation calculations, saving you time and effort while providing accurate results. In this blog post, we will explore the benefits of using a linear equation program for the TI84 calculator, including its ability to handle different forms of linear equations, fix standard form, and identify vertical or horizontal lines. Additionally, we will address common input errors, and mention other available programs for quadratic equations and other first-degree equations.

Now you can buy, download and use LINEQ to help you with your math class:

Multiple Input Options for Different Forms of Linear Equations

Slope Int output

One of the key benefits of using the LINEQ linear equation program for the TI84 calculator is its ability to accept different input options for various forms of linear equations. Whether you have the slope-intercept form (y = mx + b), point-slope form (y – y1 = m(x – x1)), two points ( (x1, y1) and (x2, y2)), or even standard form (ax + by = c) of a linear equation, you can input it into the program, and it will output the results in the slope-intercept form, standard form, slope, parallel slope, perpendicular slope, and the X and Y intercepts. This flexibility allows you to work with different forms of linear equations interchangeably, saving you the time and effort of manually converting between them.

Fixing Standard Form

Standard Form bad input
Standard Form Good Output

Standard form (ax + by = c) is a common representation of linear equations that can sometimes pose challenges due to its specific format. A linear equation program for the TI84 calculator can automatically fix standard form equations by rearranging them into the slope-intercept form (y = mx + b), which is a more commonly used and easily interpretable form of a linear equation. This feature eliminates the need for manual rearrangement and ensures that the linear equations you input are in the correct form for further calculations. Also, it will fix the standard form even if you input standard form incorrectly (ie, entering a negative number or non-integer as the X-coefficient).

Identifying Vertical and Horizontal Lines

Standard Form Vertical Input
Standard form horizontal input
Standard form vertical output
Standard Form Horizontal Output

Furthermore, the linear equation program can also identify vertical or horizontal lines, which have unique characteristics that require special attention. A vertical line has an undefined slope, and its equation can be expressed as x = c, where c is a constant. A horizontal line, on the other hand, has a slope of 0, and its equation can be expressed as y = c, where c is a constant. The linear equation program can automatically recognize these special cases and provide the appropriate results, saving you the effort of manually identifying and handling them separately.

Accurate Results for Complex Linear Equations

Linear equation programs for the TI84 calculator use advanced algorithms to provide accurate results. These programs can handle complex equations with ease, including equations with decimals, fractions, and negative numbers. The TI84 calculator itself is known for its high level of accuracy in calculations, making it a reliable tool for any linear equation calculation. You can trust the results provided by the linear equation program, knowing that they are precise and dependable.

Easy-to-Use Interface for Quick and Effortless Calculations

Another significant benefit of using a linear equation program for the TI84 calculator is its user-friendly interface. The calculator is widely used in schools and universities, and the linear equation program is designed to be easy to use, making it accessible to students and professionals alike. The program has a straightforward input process, with clear instructions that guide you through the steps needed to input your linear equation. Once you have input your equation, the program quickly and accurately provides the results you need, without the need for complex calculations or formulas.

Addressing Common Input Errors

The most common problem when using your LINEQ program is misusing the signs. Be sure to know how to use the negative sign. It’s the button below the 3 and to the left of your enter key. It looks like this (see bottom center of image):

Screenshot 2023-04-17 at 4.36.38 PM

Even though our brains can distinguish between a negative sign and a minus sign, the TI84 Plus CE, alas, cannot. So, be sure to use the negative sign (-) when you enter negative values.

The next most common error is to enter in a quadratic equation. Please keep in mind that the LINEQ can handle only linear equations. Basically, that means your LINEQ program is limited to only first-degree equations. That’s when X is only in the first-degree, or first power. Anything with X raised to a higher power cannot be entered into the LINEQ program.

Availability of Programs for Quadratic Equations and Other First-Degree Equations

While the linear equation program is an essential tool for anyone working with linear equations, there are other programs available for quadratic equations and other first-degree equations. These programs can provide solutions for more complex equations, including those that cannot be solved by hand. By utilizing these programs, you can save time and effort, and ensure that your results are accurate, even for the most challenging equations.

QUAD Program to Solve Your Quadratic Equations

QUAD input
QUAD input 2
QUAD output
QUAD output 2

But, if you do have a quadratic you need to solve, you can use the QUAD program. Click here for your free download of the QUAD program. It’ll solve any X-squared equations.

Notice how it shows the decimal version of your answers along with the discriminant version. That’ll help you solve all your Quadratic equations!

ASOLVE: Your Algebra Equation Problem Solver

If you have any type of algebraic equation, you can use ASOLVE, the algebra equation TI84 program. It will solve any first-degree equation, be it a first-degree equation; logarithmic expression; fractional equation; exponential equation; rational expression; or radical equation.

Please keep in mind ASOLVE will work only if there is one solution for X. For any equations where there are no solutions, infinite solutions, or 2 or more solutions, ASOLVE will fall short. Yet, there’s a 90% guarantee your ASOLVE answer will be correct.


The linear equation program for the TI84 calculator is an essential tool for anyone working with linear equations. Its ability to handle different forms of linear equations, fix standard form, identify vertical or horizontal lines, address common input errors, and provide accurate results for complex equations makes it an invaluable asset for students and professionals alike. Its user-friendly interface and availability of other programs for quadratic equations and other first-degree equations make it a must-have tool for anyone looking to streamline their linear equation calculations. By utilizing the linear equation program, you can save time and effort, while ensuring that your results are accurate and reliable.

The information here ought to help you get started on solving your linear equation problems much more easily and accurately. Just be sure to learn to solve them without your calculator. Nowadays, a lot of math teachers are allowing students to use their calculators only for a portion of their exam. So, be safe and learn all your equations. If you need help learning that, set up an online math tutoring session by clicking on the button below:

TI84 Program Requests

Please contact us to let us know if you have any requests for topics to cover in future TI84 programs. Or, if you’d like a modification to any of our current programs, including LINEQ.


By Martin

Martin McSweeney is a National Merit Finalist, Pomona College Graduate, and member of MENSA. He has worked at the Center for Talented Youth (Loyola Marymount University campus); Upward Bound (Harvey Mudd campus); various test prep companies; and Whittier High School. Now, Martin helps students of all abilities improve their relationship with math.