# Equations

This app lets you solve equations and linear systems. The solutions are given in an exact or approximated form according to the equation.

## Solve an equation

### Enter an equation

When you open the application, press ok to add an equation. A pop-up opens to suggest equation templates that you can then modify. If you do not wish to use a template, choose Empty.

Enter your equation in the text field at the bottom of the screen. You can use any lowercase letter as unknown: press alpha then a letter to display it or simply press the xnt key to display the letter x.

Confirm by pressing ok once you have entered your equation.

To display the = sign, press shift and then press pi. If you validate without writing a sign = in your equation, it will be automatically added.

### Solutions

To get the solutions of the equation, select the Solve equation button at the bottom of the screen and press ok.

If the input equation is a quadratic equation, the solutions x0 and x1 are automatically given in an exact form.

The table also displays the value of the discriminant.

#### General case

Generally, solutions are computed numerically and their value is often approximated.

When you press the button Solve the equation, the application then asks you to set an interval in which to search for the solution.

Set the values of Xmin and Xmax and press the button Solve the equation.

If there are too many solutions, the calculator only displays the first ten.

## Solving a system of equations

### Enter a system of equations

To enter a system, simply proceed as before. When you add a second equation, the application displays the equations as a system.

You can use any lowercase letter as unknown again.

Up to 6 equations can be added.

### Solutions

The application solves linear systems with real or complex coefficients.

To get the solutions, select the Solve the system button at the bottom of the screen and press ok.

The application gives the solutions in exact form. It also indicates if there is an infinity of solutions or if there is no solution.