Answer:
Step-by-step explanation:
5a - 4b - c = 8
4a + 2b - c = 2
3a + 4b + 3c = -16
by adding equation 1 and 2 we get
8a + 2c = -8
4a + c = -4
c = -4 - 4a
now substitute c in the 2nd equation
4a + 2b +4 + 4a = 2
8a + 2b = -2
4a + b = -1
b = -1 - 4a
we have b and c in terms of a, now let's find a
5a - 4(-4-4a) - (-1 - 4a) = 8
5a + 16 + 16a + 1 + 4a =8
25a = -9
a = -9/25
b = -1 - 4(-9/25)
b= -1+36/25=11/25
c=-4 -4a = -4 +36/25=-53/25
