I'm trying to teach myself how to simplify expressions and I'm having trouble with these two:
1. x - 2(9 + 6x)
2. 2(x - y)
I have been told that the answers are:
1. -11x -18
2. 2x - 2y
... but I have no idea how to get those answers.
This is how I tried to simplify them:
1. x - 2(9) + x - 2(6x)
2. 2(x) + 2(-y)
I think that is not right, but I don't understand what I'm doing wrong. How do you simplify these?
Thanks for any help.