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it is easier to substitute them for letters because if we used numbers then constants (numbers in algebra that don't have letters) would get mixed up with the algebraic letters. also makes things easier to read and to understand. also, if you don't have all the information, you can use letters to represent what you don't know
Add together the given angles, or the angles you already know or have been given measures for, and then subtract the added numbers from 180 and that is you answer.
Just X to the second power minus nine. You can't subtract nine from x to the second power unless you know what x is.
If the solution contains one variable which has not been fixed then there are infinitely many solution.
In plane geometry the angles in a triangle always add to 180 degrees. Add the two angles you know together and subtract the total from 180. This will give you the third angle.70 + 65 = 135.180 - 135 = 45