the cost of the meal is 21.60 with a tip. how much is the meal without the tip? let x = cost of meal without tip
the tip is 20% of x or 0.2x
together, x + 0.2x =21.60
1.2x = 21.6
x = 18 I obviously am lacking in my percents, and or decimals because I think I know how to add and subtract but still do not realize how 21.60 - 0.2 equals 18. easy question I know I just dont see it
That's all good. Did you do that yourself or was that an example out of the book?
The next step is to combine the "like terms" on the left side of the equation. No need to move anything to the right side. Your variable is already isolated on the left. Just add 1x + 0.2x to get 1.2x.
Now, all that's left to do is divide both sides of the equation by 1.2 in order to have x completely alone on the left side and the solution on the right side.
You need to practice more on general equation like this. Take a look at this tutorial here that's run by a friend of mine: Solving Linear Equations: 'One-Step' Equations