Try this:
> LinePlot(1,1)
> LinePlot=function(a,b){
+ # a = slope
+ # b = y intercept
+ x=seq(-10,10,0.4)
+ y=a*x+b
+ plot(x,y, type="l")
+ title(paste("a=",a,"b=",b))
+ }
>
> #test
> LinePlot(a=-2,b=9)
HTH
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