Question: how to plot 2d: x=a, y=b of which a and b are random constants?

Hi. How to plot the 2d output like this? I don't know how to declare "a" and "b" random constant?
The pair of equations x = a and y = b graphically represents lines which  are, a. parallel , b. intersecting at (b, a), c. coincident, d.  intersecting at (a, b)

a := (rand(3 .. 4))(); b := (rand(0 .. 3))(); plot(x = a); plot(y = b)

3

 

2

 

Error, (in plot) unexpected option: x = 3

 

Error, (in plot) unexpected option: y = 2

 
 

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Download x=a_y=b_plot.mw

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