The constant in the expression-2x is?

-2

Step-by-step explanation:

Well if we break - 2x apart we see that it's really just - 2 * x.

Now, let's say you completely forget this you can think of it like this:

-2x is, - 2 and x.

Between these two terms x is the variable leaving - 2.

You can try the same thing with these:

5x is?

-9x is?

50x is?