SOLUTION: what is the measure of angle C in a triangle with angle A is 2x angle B is 3x-9 and angle C is 2x which makes the equation 2x+3x-9+2x=180 degrees i know to add like terms which giv

Algebra ->  Angles -> SOLUTION: what is the measure of angle C in a triangle with angle A is 2x angle B is 3x-9 and angle C is 2x which makes the equation 2x+3x-9+2x=180 degrees i know to add like terms which giv      Log On


   

Question 1007601: what is the measure of angle C in a triangle with angle A is 2x angle B is 3x-9 and angle C is 2x which makes the equation 2x+3x-9+2x=180 degrees i know to add like terms which gives you 7x-9=180 add nine to both sides and you get 7x=189 then divide 7/189 which comes out to 27 then solve for angle C using 2x=__degrees thats the part where I get lost I don't know what to do with the 27 and 2x can someone help me so I can help my daughter
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
7x-9%2B9=180%2B9
7x=189
So far, so good.

Then, .... what?

How do you UNDO the factor of 7 on the x?

7x%281%2F7%29=189%281%2F7%29

7%281%2F7%29x=189%2F7

x=189%2F7----------Now, what is this?

x=%289%2A3%2A7%29%2F7

highlight%28x=27%29

You are given that measure of angle C is 2x and you now have x=27.
This should be clear and obvious. 2x=x+x.