[R] To make a graph for 4 functions

[quantum]

lets say I have these function and I want to have a graph on them

y0=x^2
y1=x^3

Then I say this

x=seq(0,10,length.out=100)
plot(x,y0,y1,type="l")

but R does not give me a graph. How would you do it?

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