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...lished as the number of lines I will be adding to a plot will be changing over time. Thanks again for any insights and feedback. plot(1,1, xlim=c(1000,4000), ylim=c(100000,800000), col=0, xlab=c("Sq. Footage"), ylab=c("Cost ($)")) square_footage_values<-c(1000:4000) initial_val<-300 cost_per_square_footage_vals<-seq(from=100, to=200, by=10) for(ii in 1:length(cost_per_square_footage_vals)) { lines(square_footage_values, cost_per_square_footage_vals[ii]*square_footage_values) }