[R] drawing a circle using symbols

[Troels Ring]

Dear friends, I was drawing a circle with centrum in (1,-1) and 
radius 5 to show my girl that the line y=3*x+1 goes through (1,4) and 
(-2,-5) of the circle, but on Windows XP, R 2.20 the drawing was not 
good at all, and the known solutions were not shown in the graph. I 
guess I got it wrong? Is this use not intended ?

Best wishes
Troels Ring, MD
Aalborg, Denmark

symbols(x=1,y=-1,circles=5,inches=FALSE, xlim=c(-10,10),ylim=c(-10,10))
curve(3*x+1,-10,10,1000,add=T)
abline(v=c(-2,1))
abline(h=c(-1,-5,4))