Hitunglah nilai a,b,dan c dari 3a+2b-c=4 2a+b+c=7 A-b+c=2

a - b + c = 2
c = 2 + b - a

2a + b + c = 7
2a + b + 2 + b - a = 7
a + 2b = 5 ... 1

3a + 2b - c = 4
3a + 2b - 2 - b + a = 4
4a + b = 6 ... 2

1 dan 2
a + 2b = 5 | x4 |
4a + b = 6 | x1 |
4a + 8b = 20
4a + b = 6
7b = 14
b = 2
4a + b = 6
4a + 2 = 6
4a = 4
a = 1