tolong dong jalannya cara nyari A,B,C

4A + 2B = 4
-4A + B = 0
----------------- +
B = 4
4A - B = 0
4A - 4 = 0
4A = 4
A = 1
A + C = 1
1 + C = 1
C = 0 , semoga membantu, mudah kan...? sayang kalau finishing unsucces