You can use `GeoGebra`

to solve systems of equations.

`GeoGebra`

Instruction 1

`CAS`

- 1.
- Open
`CAS`

under`View`

in`Menu`

. - 2.
- Enter your equations one by one in
`CAS`

, pressing`Enter`

to start a new row for each of your equations. - 3.
- Select each of the rows with an equation in them by clicking the boxes with a row number. You’ll know that the row is selected when the box with the row number has turned purple. To select more than one box at a time, hold down the
`Shift`

key, click the box of the first equation and then click the box with the row number of the last equation. - 4.
- Click
`Solve`

.

If you get $\{\}$ as the output, the system of equations has no solution. If `GeoGebra`

returns one of the variables as a function, the system of equations has infinitely many solutions.

You can solve a system of equations graphically by plotting all the graphs in the same coordinate system. The solutions are intersections between the graphs.

`GeoGebra`

Instruction 2

`Graphics View`

- 1.
- Open
`Algebra View`

and`Graphics View`

under`View`

in`Menu`

. - 2.
- Enter your equations one by one in
`CAS`

, pressing`Enter`

to start a new row for each. - 3.
- In
`Toolbar`

, click`Intersect`

. If you can’t find the button, check that you have the`Toolbar`

for`Graphics View`

by clicking on any empty space inside the`Graphics View`

window. Then find the button under the`Point`

tool list. - 4.
- Click the graphs in
`Graphics View`

. The order does not matter. - 5.
- The solutions are given in
`Algebra View`

as coordinates of the intersection points.