You can combine the functionality of the [img]https://wiki.geogebra.org/uploads/thumb/4/47/Menu_view_cas.svg/16px-Menu_view_cas.svg.png[/img] [i]CAS View[/i] with the graphing capabilities of the [img]https://wiki.geogebra.org/uploads/thumb/c/c8/Menu_view_graphics.svg/16px-Menu_view_graphics.svg.png[/img][i]Graphics View[/i].[br][br][b]Note:[/b] Depending on which of the [i]Views[/i] is activated, either the [i]Graphics View Toolbar[/i] or the [i]CAS View Toolbar[/i] are shown at the top of the app[size=100].[/size]

Combine the [img]https://wiki.geogebra.org/uploads/thumb/4/47/Menu_view_cas.svg/16px-Menu_view_cas.svg.png[/img] [i]CAS View[/i] and the [img]https://wiki.geogebra.org/uploads/thumb/c/c8/Menu_view_graphics.svg/16px-Menu_view_graphics.svg.png[/img] [i]Graphics View[/i] by following the instructions below.

[table][tr][td][size=100]1.[/size][/td][td][icon]https://wiki.geogebra.org/uploads/thumb/4/47/Menu_view_cas.svg/32px-Menu_view_cas.svg.png[/icon][/td][td][size=100]Enter the linear equation [code]y = 2 x + 1 [/code]into the first row of the [i]CAS View [/i]and press the [i]Enter [/i]key.[/size][/td][/tr][tr][td][size=100]2.[/size][/td][td][size=100][icon]https://wiki.geogebra.org/uploads/thumb/4/4d/Algebra_hidden.png/32px-Algebra_hidden.png[/icon][/size][/td][td]Display the equation as a line by clicking on the disabled [i]Visibility [/i]button next to the equation.[/td][/tr][tr][td]3.[/td][td][icon]https://wiki.geogebra.org/uploads/thumb/c/c8/Menu_view_graphics.svg/32px-Menu_view_graphics.svg.png[/icon][br][/td][td]Click anywhere in the [i]Graphics View[/i] to show the [i]Graphics View Toolbar[/i].[br][/td][/tr][tr][td][size=100]4.[br][/size][/td][td][icon]/images/ggb/toolbar/mode_move.png[/icon][br][/td][td][size=100]Select the [i]Move[/i] tool [size=100]and select the line. Click on the [img width=16,height=12]https://lh4.googleusercontent.com/9kckeXCdJGBgMCEHMVsq_b-7Sj3EpBus_T7dXQUGJNNxQ_GWiLHpW_OO6POOqmYiaaaW-4r9lLac11lt9IfNaxs-RhbG19waa1-alNcYjFfs3MEtYltRBhiDMGZfEYh2deQp6cci[/img] Style Bar and select [img width=27,height=27]https://lh4.googleusercontent.com/qo523vBe2kp06yE5TSzbf5veSz_CV34lt_euYe2WGK6ewHItOP38C0w2vW_ivGhlTw7peLuSMPp14_EiQQZCuqjM2NishFBqoT8zXa0BygW9_FRs9nThmzGWLtSAmsZXmJbzWBh2[/img] to unfix the function and to be able to drag the function[/size] in the [img]https://wiki.geogebra.org/uploads/thumb/c/c8/Menu_view_graphics.svg/16px-Menu_view_graphics.svg.png[/img] [i]Graphics View[/i]. [br][b]Note:[/b] The [img]https://wiki.geogebra.org/uploads/thumb/4/47/Menu_view_cas.svg/16px-Menu_view_cas.svg.png[/img] [i]CAS View [/i]always shows the current equation of the line.[br][/size][/td][/tr][/table]

[table][tr][td][size=100]5.[/size][/td][td][size=100][icon]https://www.geogebra.org/images/ggb/toolbar/mode_point.png[/icon][/size][/td][td][size=100]Activate the [i]Point [/i]tool. Click at the coordinates [i](2, 1)[/i] to create a point [i]A[/i].[/size][/td][/tr][tr][td][size=100]6.[/size][/td][td][size=100][icon]https://wiki.geogebra.org/uploads/thumb/4/47/Menu_view_cas.svg/32px-Menu_view_cas.svg.png[/icon][/size][/td][td]In the [i]CAS View[/i], enter [i]A[/i] into the next row to show the point's coordinates.[/td][/tr][tr][td]7.[/td][td][icon]/images/ggb/toolbar/mode_orthogonal.png[/icon][br][/td][td]Activate the [i]Perpendicular Line[/i] tool from the [i]Graphics View Toolbar[/i]. Successively select the line and point [i]A [/i]to create a perpendicular line [i]g[/i].[br][/td][/tr][tr][td][size=100]8.[/size][/td][td][size=100][icon]https://wiki.geogebra.org/uploads/thumb/4/47/Menu_view_cas.svg/32px-Menu_view_cas.svg.png[/icon][/size][/td][td][size=100]Enter [i]g[/i] in the next row of the [i]CAS View[/i] and press the [i]Enter [/i]key.[br][b]Note:[/b] The equation of the perpendicular line [i]g[/i] is now displayed in the [i]CAS View[/i].[/size][/td][/tr][tr][td][size=100]9.[br][/size][/td][td][size=100][icon]/images/ggb/toolbar/mode_move.png[/icon][br][/size][/td][td][size=100]Select the [i]Move[/i] tool from the Graphics View Toolbar and drag point A. [br][b]Note:[/b] The equation of line [i]g[/i] adapts to your changes.[br][/size][/td][/tr][/table]