write the following using algebraic notation, using the letter x for any unknown numbers: i think of a number, multiply it by two, then subtract 9
I think of a number.
mmm I chose 8
I multiply it by 2 so that is 2*8
I subtract 9 so that is 2*8-9
Now I do the same thing only I let the number I choose be x. Try it.
(You have to just pretend that x is a number)