Answer:
The solution is
( - 3 , 4 , 8)
Step-by-step explanation:
2a - b + c = -2........ 1
a - b = - 7 ..................2
2a + b = - 2 ............3
Make b the subject in the second equation and substitute it into the third equation
That's
b = a + 7
2a + a + 7 = - 2
3a = - 2 - 7
3a = - 9
Divide both sides by 3
a = - 3
Substitute a = - 3 into b = a + 7
b = - 3 + 7
b = 4
Substitute a and b into the first equation
That's
2(-3) - 4 + c = - 2
- 6 - 4 + c = - 2
-10 + c = - 2
c = - 2 + 10
c = 8
Therefore
a = - 3 b = 4 c = 8
Hope this helps you
