Why do two negatives equal a positive when multiplying?

They cancel out each other

Imagine if you were multiplying

-2 * - 3

you would get 6

if you did

-2 * 3

you would get - 6 because there isn't another - to cancel it out

I learned it that when you have a negative before a negative, put parenthesis around the second number with the negative, so it looks like this

- (-2)

if you look at the - ( - it looks like a plus sign

that probably doesn't make much sense but we cancelling it out is just a rule, we don't really know why we do it