Question: Plotting with parameters for a constant

I want to plot y=f(x) where f(x) may be in the form: f(x) = kx... I need to supply several values, or parameters, for the constant k. For example, k=2,4,8,10. If I can get someone's help on this plotting question, I think I'll be on my way to figuring out other issues using the Mable Help menus. I'm a self-study student, so I don't have a professor to check with. Thx. (I realize this is extremely simple)

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