Difference between revisions of "Lines and Axes"
From GeoGebra Manual
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Revision as of 21:18, 9 March 2013
Lines
You can enter a line as a linear equation in x and y or in parametric form into the Input Bar. In both cases previously defined variables (e. g. numbers, points, vectors) can be used within the equation.
Note: You can enter a line’s name at the beginning of the input followed by a colon.
Example:
- Type in
g: 3x + 4y = 2to enter line g as a linear equation. - You can enter a line in parametric form thus:
g: X = (-5, 5) + t (4, -3) - Define the parameters m = 2 and b = -1. Then, you can enter the equation
h: y = m*x + bto get a line h in y-intercept-form.
Axes
The two coordinate axes are available in commands using the names xAxis and yAxis.
Example: The command
PerpendicularLine[A, xAxis] constructs the perpendicular line to the x-axis through a given point A.Comments
Get parameters of a line[edit]
From the line a: 2.2 x + 3.3 y = 4.4 you'll get with
x(a)the value 2.2y(a)the value 3.3z(a)the value -4.4 (because GeoGebra save the line equation as2.2 x + 3.3 y - 4.4 = 0.
More informations: Coefficients Command
