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7.7.1  Draw a line: line

line takes as argument cartesian equation(s):

line defines and draws the corresponding line.
Input:

line(2*y+x-1=0)

Output:

the line 2*y+x-1=0

Input:

line(y=1)

Output:

the horizontal line y=1

Input:

line(x=1)

Output:

the vertical line x=1

Input:

line(x+2*y+z-1=0,z=2)

Output:

the line x+2*y+1=0 in the plane z=2

Input:

line(y=1,x=1)

Output:

the vertical line crossing through (1,1,0)

Remark
line defines an oriented line:


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