abline does not work

Hi All,
Could you help me with this please?.
abline function does not work.

#Covarianza

x numero de comerciales.

y volumen de ventas.

x<-c(2,5,1,3,4,1,5,3,4,2)
y<-c(50,57,41,54,54,38,63,48,59,46)
plot(y~x)
abline(v=51, col="red")

Many Thanks

Do you mean to set h = 51 in abline?

abline(h=51, col="red")

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