plotting 3 functions in the same graph

How can I graph (x,y1), (x,y2), (x,y3) without having them overlapped ( I want to be able to distinguish them from each other) ? I want to have a graph which includes three of them at the same time.

x = from 1000 to 100000000

y1 = 1000 * x

y2 = x^2

y3 = x

[Rik]

What do you mean with the graphs not overlapping? y2 and y3 will overlap for x=1000. Or do you mean that each graph should have a different color?

[Noi Sekuri]

What I mean is that when I plot these, I cannot distinguish between y1 and y3. I dont want this to happen.

Answer 1

[KSSV]

subplot(311)
plot(x,y1)
subplot(312)
plot(x,y2)
subplot(313)
plot(x,y3)