plot - Create mulitple line chart in R -


i have following dummy data. 

set.seed(45) df <- data.frame(x=rep(1:5, 9), val1=sample(1:100,45), val2=sample(1:100,45),variable=rep(paste0("category",1:9),each=5))

i plot val1 , val2 based on x (which in real data sequence of date values). how can accomplish this. have tried ggplot2, mplot, , plot without success. have looked @ other similar posts not work or address needs.

thank you.

more ggplot2 options, without reshaping data

## on 1 ggplot(df, aes(x, val1, color=variable, linetype="a")) +   geom_line() +   geom_line(aes(x, val2, color=variable, linetype="b")) +   theme_bw() + ylab("val") +   scale_linetype_manual(name="val", labels=c("val1", "val2"), values=1:2)

enter image description here

## faceted ggplot(df, aes(x, val1, color=variable, linetype="a")) +   geom_line() +   geom_line(aes(x, val2, color=variable, linetype="b")) +   theme_bw() + ylab("val") +   guides(color=false) +   scale_linetype_manual(name="val", labels=c("val1", "val2"), values=1:2) +   facet_wrap(~variable)

enter image description here


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